Stupidity,--unconscious ignorance.

Wisdom that don't make us happier ain't worth plowing for.

Reason often makes mistakes, but conscience never does.

Jealousy is one of love's parasites.

If men were stubborn just in proportion as they were right, stubbornness would take her seat among the virtues; but men are generally stubborn just in proportion as they are ignorant and wrong.

If you believe you can do something, then you can acquire the ability to do it even if you didn't have it in the beginning.

Man is my brother, and I am nearer related to him through his vices than I am through his virtue.