A quote
For I have made trial of my spirit on a sudden—a simpler and a truer test. Indeed, when a man has made preparations and given himself a formal summons to be patient, it is not equally clear just how much real strength of mind he possesses; the surest proofs are those which one exhibits off-hand, viewing one’s own troubles not only fairly but calmly, not flying into fits of temper or wordy wranglings, supplying one’s own needs by not craving something which was really due, and reflecting that our habits may be unsatisfied, but never our own real selves.
Seneca·Letter 123 — On the Conflict Between Pleasure and Virtue (§5)·trans. Gummere