The truth is that virtue is not different than any other skill. You don't have it or not have it. You do it or you don't do it. And you get better at it the more you do it. This is the fundamental insight of Aristotle, that excellence is not innate. It is a habit.
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The art of living is more like wrestling than dancing, in so far as it stands ready against the accidental and the unforeseen, and is not apt to fall.
Marcus Aurelius — Meditations
It is not length of life, but depth of life. Cut these questionings short, and accept the universe as it is, and work in it rather than to understand it.
Ralph Waldo Emerson — Journals
When you are delighted with anything, be delighted as with a thing which is not one of those which cannot be taken away, but as something of such a kind, as an earthen pot is, or a glass cup, that, when it has been broken, you may remember what it was and may not be troubled… What you love is nothing of your own: it has been given to you for the present, not that it should not be taken from you, nor has it been given to you for all time, but as a fig is given to you or a bunch of grapes at the appointed season of the year.
Epictetus