For what is lacking now is not quibbles; nay, the books of the Stoics are full of quibbles

The essence of the good is a certain kind of moral purpose, and that of the evil is a certain kind of moral purpose.

For human beings, the measure of every action is the impression of the senses.

Appearances to the mind are of four kinds. Things either are what they appear to be; or they neither are, nor appear to be; or they are, and do not appear to be; or they are not, and yet appear to be. Rightly to aim in all these cases is the wise man's task.

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

"If the room is smoky, if only moderately, I will stay; if there is too much smoke I will go. Remember this, keep a firm hold on it, the door is always open."

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?

It is difficulties that show what men are.

If it is my interest to have a farm, it is my interest to take it away from my neighbour; if it is my interest to have a cloak, it is my interest also to steal it from a bath. This is the source of wars, seditions, tyrannies, plots.

Who are those people by whom you wish to be admired? Are they not these about whom you are in the habit of saying that they are mad? What then? Do you wish to be admired by the mad?