We ought to flee the friendship of the wicked, and the enmity of the good.
We have two ears and one mouth so that we can listen twice as much as we speak.
If we are not stupid or insincere when we say that the good or ill of man lies within his own will, and that all beside is nothing to us, why are we still troubled?
Freedom is secured not by the fulfillment of one's desires, but by the removal of desire.
Don't regard what anyone says of you, for this, after all, is no concern of yours.
Everything has two handles,-one by which it may be borne; another by which it cannot.