All 3 Uses

stoic
in
Self-Reliance, by Emerson
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Let a Stoic[226] open the resources of man, and tell men they are not leaning willows, but can and must detach themselves; that with the exercise of self-trust, new powers shall appear; that a man is the word made flesh,[227] born to shed healing to the nations,[228] that he should be ashamed of our compassion, and that the moment he acts from himself, tossing the laws, the books, idolatries and customs out of the window, we pity him no more, but thank and revere him,—and that teacher shall restore the life of man to splendor, and make his name dear to all history.†
For every Stoic was a Stoic; but in Christendom where is the Christian?†
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For every Stoic was a Stoic; but in Christendom where is the Christian?†

Definitions:

(1) (stoic)
seeming unaffected by pleasure, pain, or emotions
(2) (meaning too rare to warrant focus)
More rarely, a stoic can refer to a member of the ancient Greek school of philosophy founded by Zeno (known for striving to be unaffected by pleasure, pain, or emotions).