Ecclesiastes 1:18; Ecclesiastes 2:23; Ecclesiastes 7:9

Ecclesiastes 1:18

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

Ecclesiastes 2:23

23 For all his days are sorrows, and his travail grief; yea, his heart taketh not rest in the night. This is also vanity.

Ecclesiastes 7:9

9 Be not hasty in thy spirit to be angry: for anger resteth in the bosom of fools.