The most necessary learning is that which unlearns evil.
Not to unlearn what you have learned is the most necessary kind of learning.
As rust corrupts iron, so envy corrupts man.
To all my friends without distinction I am ready to display my opulence: come one, come all; and whosoever likes to take a share is welcome to the wealth that lies within my soul.
As iron is eaten away by rust, so the envious are consumed by their own passion.
The advantages of philosophy? That I am able to hold converse with myself.