It is not things in themselves which trouble us, but our opinions of things.
The two powers which in my opinion constitute a wise man are those of bearing and forbearing.
There is nothing good or evil save in the will.
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.
Fortify yourself with contentment, for this is an impregnable fortress.
It is the act of an ill-instructed man to blame others for his own bad condition; it is the act of one who has begun to be instructed, to lay the blame on himself; and of one whose instruction is completed, neither to blame another, nor himself.