Discourses. Chap. xxi.

When one maintains his proper attitude in life, he does not long after externals. What would you have, O man?

Discourses. Chap. xxi.

Difficulties are things that show what men are.

Discourses. Chap. xxiv.

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?

Discourses. Chap. xxv.

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

Discourses. Chap. xxvi.

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.