Authentic happiness is always independent of external conditions.

Do you know that disease and death must needs overtake us, no matter what we are doing?... what do you wish to be doing when it overtakes you?... If you have anything better to be doing when you are so overtaken, get to work on that.

Freedom isn't the right or ability to do whatever you please. Freedom comes from understanding the limits of our own power and the inherent limits set in place by nature. By accepting life's limits and inevitabilities and working with them rather than fighting them, you become truly free.

The essence of good and evil is a certain disposition of the will.

Let silence be your general rule; or say only what is necessary and in few words.

When a man is proud because he can understand and explain the writings of Chrysippus, say to yourself, 'if Chrysippus had not written obscurely, this man would have had nothing to be proud of.'

In theory there is nothing to hinder our following what we are taught;but in life there are many things to draw us aside.