A prudent man concealeth knowledge: but the heart of fools proclaimeth foolishness.
Proverbs 22:15Foolishness is bound in the heart of a child; but the rod of correction shall drive it far from him.
Ecclesiastes 9:3This is an evil among all things that are done under the sun, that there is one event unto all: yea, also the heart of the sons of men is full of evil, and madness is in their heart while they live, and after that they go to the dead.