Nobody knows anything, but I, knowing nothing, am the smartest man in the world.
There are two kinds of disease of the soul, vice and ignorance.
Knowing thyself is the height of wisdom.
The years wrinkle our skin, but lack of enthusiasm wrinkles our soul.
Prefer knowledge to wealth, for the one is transitory, the other perpetual.
Such as thy words are, such will thy affections be esteemed; and such will thy deeds be as thy affections and such thy life as thy deeds.