There are wise men and there are fools. Even if this classification may be relative, let us keep an open mind and look at some great men's words on the comparisons.

A wise man changes his mind; a fool never will. - Spanish proverb.

For one word a man is often deemed to be wise, and for one word he is often deemed to be foolish. We should be careful indeed what we say. - Confucius.

Medicine in the hands of a fool is poison, just as poison becomes medicine in the hands of the wise. - Giacomo Casanova.

The wise approve anything after scrutiny, whereas fools are led by others' opinions. - Unknown.