This Bible contradiction is from the Skeptic's Annotated Bible.

Verses

It is good to be foolish.

1 Corinthians 1:21 View context

For after that in the wisdom of God the world by wisdom knew not God, it pleased God by the foolishness of preaching to save them that believe.

1 Corinthians 3:18 View context

Let no man deceive himself. If any man among you seemeth to be wise in this world, let him become a fool, that he may be wise.

1 Corinthians 4:10 View context

We [are] fools for Christ's sake, but ye [are] wise in Christ; we [are] weak, but ye [are] strong; ye [are] honourable, but we [are] despised.

It is not good to be foolish.

Psalm 5:5 View context

The foolish shall not stand in thy sight: thou hatest all workers of iniquity.

Ephesians 5:15 View context

See then that ye walk circumspectly, not as fools, but as wise,