Ambrose Bierce
Wisdom is known only by contrasting it with folly

Amelia Barr
To take offence is a great folly, and to give offence is a great folly — I know not which is the greater.

Anton Chekhov
Any idiot can face a crisis, it is this day-to-day living that wears you out.”

George Eliot
However, I'm not denying' the women are foolish: God Almighty made 'em to match the men.

Isaac Asimov
And the hope that the war against folly may someday be won, after all.

Isaac Asimov
There are limits beyond which your folly will not carry you. 

Lord Byron Quote - Folly loves the martyrdom of fame. -
Lord Byron
Folly loves the martyrdom of fame.

Lord Byron
If I am fool, it is, at least, a doubting one; and I envy no one the certainty of his self-approved wisdom.

Saint Augustine
Wisdom and folly both are like meats that are wholesome and unwholesome, and courtly or simple words are like town-made or rustic vessels —both kinds of food may be served in either kind of dish.

William Blake
If the fool would persist in his folly he would become wise.