Marcus Aurelius

Because your own strength is unequal to the task, do not assume that it is beyond the powers of man; but if anything is within the powers and province of man, believe that it is within your own compass also.

Reject your sense of injury and the injury itself disappears.

A cucumber is bitter. - Throw it away. -
There briars in the road? - Turn aside from them.
This is enough.  Do not add, And why were such things made in the world?

...the infallible man does not exist.

...small too even the longest fame thereafter, which is itself subject to a succession of little men who quickly die, and have no knowledge of themselves, let alone of those long dead.

It is like the officer who engaged a comic actor dismissing him from the stage. "But I have not played my five acts, only three." "True, but in life three acts can be the whole play."

When force of circumstance upsets your equanimity, lose no time in recovering your self-control, and do not remain out of tune longer than you can help. Habitual recurrence to the harmony will increase your mastery of it. (6:11)

Look always at the whole

Look beneath the surface: never let a thing's intrinsic quality or worth escape you.

Letting go all else, cling to the following few truths. Remember that man lives only in the present, in this fleeting instant: all the rest of his life is either past and gone, or not yet revealed. This mortal life is a little thing, lived in a little corner of the earth; and little, too, is the longest fame to come - dependent as it is on a succession of fast-perishing little men who have no knowledge even of their own selves, much less of one long dead and gone.