Isaiah gives us a frightening picture of a society in moral collapse, but he does not begin with murder, idolatry, or some spectacular public crime. He begins with judgment itself. “Woe to those who call evil good, and good evil; who substitute darkness for light and light for darkness; who substitute bitter for sweet and sweet for bitter” (Isa. 5:20). The problem is not simply that people do evil. They have reached the point where they can no longer—or will no longer—name evil correctly.

That distinction matters. Every society contains people who know something is wrong and do it anyway. Isaiah describes something more serious. The categories themselves have been reversed, so that evil receives the name of good while good is treated as evil. Then, in the next verse, Isaiah explains how people reach that point: “Woe to those who are wise in their own eyes and clever in their own sight” (Isa. 5:21).

Read together, the two woes form a progression. First, people place themselves in the position of deciding what deserves to be called good and evil. Then, because they have made themselves the final judges, the old moral distinctions can be rearranged to suit them. A society does not lose its moral judgment because it stops making moral judgments. It loses moral judgment when it becomes confident that it can make those judgments without reference to God.

For readers who want the larger literary setting of the prophet, I have discussed the book itself in Was Isaiah Written by One Author? The Unity of Isaiah Explained. BibleProject’s overview of Isaiah 1–39 also gives a useful visual introduction to the judgment and hope that surround these chapters.

Isaiah 5:20 Condemns More Than Bad Behavior

There is something strange about Isaiah’s accusation. Search the Pentateuchal law codes and you will not find a commandment that reads, “You shall not call evil good.” There are laws against murder, adultery, theft, false testimony, bribery, idolatry, and many other specific acts, but there is no statute corresponding exactly to Isaiah 5:20.

Yet no Israelite could reasonably respond, “Where does the law say I cannot call evil good?” The distinction between good and evil had been woven through Israel’s entire moral world. It appeared in the narratives, the Psalms, the wisdom literature, and the prophets. Israel had learned the distinction not only through individual commandments but through generations of stories, songs, proverbs, judgments, and warnings.

Joseph, for example, accuses his brothers of repaying evil for good in Genesis 44:4. The statement assumes that the categories already mean something. Good ought to produce good in return, while responding to good with evil represents a moral distortion that needs no separate statute to make it recognizable.

Saul makes the same distinction after David spares his life. He admits, “You have dealt well with me, while I have dealt wickedly with you” (1 Sam. 24:17). Saul does not need a lawyer to explain the difference. He knows that David has done good and that he has returned evil.

That moral vocabulary appears everywhere because biblical law was never merely a list of prohibited behaviors. Israel was being formed into a people capable of recognizing justice, righteousness, faithfulness, wickedness, oppression, mercy, good, and evil. Scripture gave them commandments, certainly, but it also trained their judgment.

This broader way of understanding biblical ethics matters for Christian discipleship as well. I have developed some of those implications in What Does Christian Discipleship Mean in Public Life?, where Torah, prophecy, wisdom, and the rest of Scripture function together to form a people under God rather than merely supply isolated religious rules.

Good and Evil Are Necessary for Justice

The distinction becomes especially important when we move from private morality into public justice. Solomon understood that connection when Yahweh offered to give him what he requested. Solomon asked for an understanding heart so that he could govern Israel and “discern between good and evil” (1 Kings 3:9).

Notice the connection. Solomon needs to distinguish good from evil because he has to judge people. Moral discernment is therefore not an ornamental virtue for unusually spiritual people. It is a prerequisite for justice.

A judge who cannot distinguish good from evil cannot administer justice. Neither can a ruler, pastor, parent, teacher, institution, or community. Once those categories become unstable, power begins deciding what deserves approval and condemnation.

The eighth-century prophets repeatedly make this connection. Amos tells Israel, “Seek good and not evil, that you may live,” and then immediately adds, “Hate evil, love good, and establish justice in the gate” (Amos 5:14–15). Loving good and establishing justice belong together because justice requires a moral standard by which conduct can be judged.

Micah makes the connection even more sharply. He addresses Israel’s rulers with the question, “Is it not for you to know justice?” Then he describes them as people “who hate good and love evil” (Mic. 3:1–2). Their public injustice grows out of moral inversion.

BibleProject’s overview of Amos develops that prophetic connection between covenant unfaithfulness and injustice. The same pattern appears repeatedly across the prophets: when worship, moral judgment, and justice separate from one another, all three become corrupted.

A Society Can Be Highly Moralistic and Still Lose Moral Judgment

We sometimes speak about moral decline as though people eventually stop caring about morality. Isaiah gives us a different picture. The people of Isaiah 5 still use moral categories; they simply apply them backwards.

They call something good. They call something evil. They approve, condemn, praise, shame, defend, and accuse. Their society remains intensely moral, but its judgment has become twisted.

That possibility should bother us because moral language by itself proves very little. A culture can speak constantly about justice while treating injustice as righteous. A church can speak constantly about holiness while rewarding conduct Scripture condemns. An institution can speak constantly about integrity while developing elaborate explanations for why its own failures should not count.

The problem is not necessarily hypocrisy in the ordinary sense. A hypocrite may know the standard and deliberately violate it. Isaiah describes people whose moral reasoning has become so distorted that they can place the wrong label on the action itself.

This is one reason moral collapse can be difficult to recognize while it is happening. People rarely announce that they have decided to become evil. They develop reasons why the thing formerly condemned should now be praised, or why something formerly recognized as good has become dangerous, foolish, hateful, or unjust.

Words begin doing moral work that arguments cannot accomplish. If an action receives a sufficiently noble description, people can stop asking whether the action itself is noble. If a person receives a sufficiently wicked label, people can excuse almost anything done against him.

Isaiah cuts through the labels. Whatever language people choose, evil remains evil and good remains good because their character does not depend upon our ability to rename them. Moral vocabulary can be corrupted, but the moral reality beneath it does not bend to our preferred terminology.

Isaiah 5:21 Explains How the Reversal Happens

Isaiah could have stopped with verse 20, but the next woe pushes the argument deeper. “Woe to those who are wise in their own eyes and clever in their own sight” (Isa. 5:21). The problem behind moral inversion is a form of self-authorized wisdom.

Proverbs provides the background. Proverbs 3:7 says, “Do not be wise in your own eyes; fear the LORD and turn away from evil.” Those commands belong together. Being wise in your own eyes stands opposite fearing Yahweh, and fearing Yahweh leads a person away from evil.

That means Isaiah is accusing Judah of something more serious than intellectual arrogance. He is describing a practical rejection of Yahweh’s authority. People who become wise in their own eyes increasingly treat their own moral reasoning as sufficient, and therefore God no longer occupies the position of final judge.

Other Proverbs reinforce the warning. “The way of a fool is right in his own eyes” (Prov. 12:15). Proverbs 26 repeatedly mocks the person who considers himself wise, and it concludes that there is more hope for a fool than for someone wise in his own eyes.

The problem is not thinking. Biblical wisdom literature constantly demands thought, observation, judgment, learning, correction, and discernment. The problem comes when human judgment closes itself to correction because the person has become his own highest authority.

BibleProject’s discussion of wisdom and the book of Proverbs captures the importance Proverbs places on wisdom ordered by the fear of Yahweh. Biblical wisdom does not ask us to become less discerning. It tells us where genuine discernment begins.

The Fear of Yahweh Protects Moral Judgment

Modern readers can easily misunderstand the “fear of Yahweh” as though biblical morality asks people to suspend judgment and obey arbitrary commands out of terror. Proverbs presents almost the opposite picture. The fear of Yahweh is precisely what enables a person to become wise.

To fear Yahweh is to recognize that reality does not begin with me. God exists before my opinions, desires, loyalties, experiences, political tribe, church tradition, economic interests, and personal sense of fairness. Therefore, all of those things may be judged.

That is what being “wise in your own eyes” refuses to permit. The self becomes the court of final appeal. Evidence can be considered and Scripture can even be consulted, but nothing is allowed to render a verdict against the judge himself.

Once that happens, moral reasoning becomes remarkably flexible. We become strict with sins that threaten our interests and creative with sins that protect them. We demand careful definitions when our people are accused, then accept sweeping accusations against people we already dislike.

The fear of Yahweh breaks that arrangement because it places every person under judgment. I do not get to determine what is good merely because I desire it. My group does not get to determine what is righteous merely because its success matters to me.

Neither does the church escape this danger by possessing the Bible. People can confess the authority of Scripture while allowing themselves to determine in practice which parts will be taken seriously. The decisive question is not simply whether we possess God’s words, but whether we permit those words to correct us.

Moral Inversion Eventually Becomes Injustice

Isaiah does not leave this discussion in the realm of ideas. Two verses later, he condemns people who “justify the wicked for a bribe, and take away the rights of the ones who are in the right” (Isa. 5:23). The progression is difficult to miss.

First comes the reversal of good and evil. Then comes confidence in one’s own wisdom. Finally, those distorted judgments reach the courtroom and the righteous lose justice. The moral confusion of Isaiah 5:20–21 becomes the public injustice of Isaiah 5:23.

That is why Isaiah treats moral language as a public concern. When people lose the ability to distinguish good from evil, the consequences eventually reach property, money, courts, institutions, reputations, and vulnerable people. Someone pays for our moral confusion.

Nehemiah faced a related problem centuries later when members of the restored community used ordinary economic arrangements in ways that crushed their neighbors. I discuss that problem in Nehemiah 5: The Wall Cannot Protect You From Injustice. The lesson is similar: a community can maintain religious identity and impressive accomplishments while becoming morally confused about what it is doing to its own people.

This also explains why the prophets refuse to separate theology from justice. Bad judgments about God eventually produce bad judgments about people. Once Yahweh is removed from his place as judge, the powerful usually find someone willing to explain why whatever benefits them should count as good.

We Usually Call Evil Good for a Reason

Few people reverse moral categories randomly. Something normally makes the reversal attractive. Money, security, reputation, desire, resentment, political loyalty, institutional preservation, fear, and ambition can all place pressure on moral judgment.

That pressure does not always make people consciously dishonest. Human beings possess an impressive ability to reason toward conclusions that preserve things they already want. Being wise in our own eyes makes that process even easier because we lose the suspicion that our judgment itself may need correction.

This is where Isaiah becomes personally uncomfortable. It is easy to read “Woe to those who call evil good” and immediately imagine somebody else. The verse quickly becomes a weapon for identifying whatever moral insanity we think is most obvious in the surrounding culture.

Yet verse 21 does not permit that easy application. If being wise in our own eyes is part of the problem, then moral certainty itself requires examination. The question is not whether we should become uncertain about good and evil, but whether our certainty has actually been formed under Yahweh’s authority.

Those are different things. Biblical humility does not mean refusing to call evil evil because we are afraid of sounding judgmental. It means being willing to have God correct what we ourselves have called good.

Recovering Moral Judgment

Isaiah’s answer is not moral relativism. He does not respond to distorted judgment by saying that good and evil are complicated words and everyone should avoid strong conclusions. His entire accusation depends upon the assumption that the categories are real.

Proverbs gives the corrective in plain language: “Fear the LORD and turn away from evil.” Amos supplies another part: “Hate evil, love good, and establish justice.” Moral renewal requires recovering both the categories and the authority behind them.

That recovery begins when we stop treating ourselves as morally self-sufficient. We bring our instincts, loyalties, traditions, desires, and judgments before God with the genuine possibility that he may condemn something we have defended. Otherwise, Scripture becomes little more than evidence collected for verdicts we already intended to deliver.

Then we learn again to call things by their right names. Good must remain good even when it comes from someone we dislike. Evil must remain evil even when acknowledging it costs our side something.

A society loses moral judgment long before it loses moral language. In fact, it may become louder and more confident in its moral language while the categories underneath it collapse. Isaiah’s warning is that the collapse begins when we claim the right to name good and evil while becoming wise in our own eyes.

The antidote is therefore deeper than better rhetoric or a new political coalition. We need the humility to acknowledge that good and evil exist before we name them, the wisdom to discern between them, and the fear of Yahweh that permits God to overrule us. Only then can we hope to judge rightly when the distinction actually costs us something.