For God shall bring every work into judgment, with every secret thing, whether it be good, or whether it be evil. Ecclesiastes 12:14
Achan acknowledged his guilt, but when it was too late for the confession to benefit himself. He had seen the armies of Israel return from Ai defeated and disheartened; yet he did not come forward and confess his sin. He had seen Joshua and the elders of Israel bowed to the earth in grief too great for words. Had he then made confession, he would have given some proof of true repentance; but he still kept silence. He had listened to the proclamation that a great crime had been committed, and had even heard its character definitely stated. But his lips were sealed. Then came the solemn investigation. How his soul thrilled with terror as he saw his tribe pointed out, then his family and his household! But still he uttered no confession, until the finger of God was placed upon him. Then, when his sin could no longer be concealed, he admitted the truth. How often are similar confessions made. There is a vast difference between admitting facts after they have been proved and confessing sins known only to ourselves and to God. Achan would not have confessed had he not hoped by so doing to avert the consequences of his crime. But his confession only served to show that his punishment was just. There was no genuine repentance for sin, no contrition, no change of purpose, no abhorrence of evil. (Patriarchs and Prophets, 497)
Reflection: So long as they can conceal their transgressions from their fellow men, many like Achan, feel secure, and flatter themselves that God will not be strict to mark iniquity. All too late their sin will find them out in that day when they shall not be purged with sacrifice or offering forever. (Patriarchs and Prophets, 498)