Ecclesiastes 1:18

For in much wisdom is much grief: and he that increaseth knowledge increaseth sorrow.
— Ecclesiastes 1:18, King James Version

In other translations

World English Bible (WEB)

For in much wisdom is much grief; and he who increases knowledge increases sorrow.

American Standard Version (ASV)

For in much wisdom is much grief; and he that increaseth knowledge increaseth sorrow.

Young's Literal Translation (YLT)

for, in abundance of wisdom <FI>is<Fi> abundance of sadness, and he who addeth knowledge addeth pain.'