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

Verses

Wisdom makes people happy.

Proverbs 3:13 View context

Happy [is] the man [that] findeth wisdom, and the man [that] getteth understanding.

Wisdom makes people miserable.

Ecclesiastes 1:18 View context

For in much wisdom [is] much grief: and he that increaseth knowledge increaseth sorrow.