“The greatest hero of Greece was Hercules. He was a personage of quite another order from the great hero of Athens, Theseus. He was what all Greece, except Athens, most admired. The Athenians were different from the other Greeks, and their hero therefore was different. Theseus was, of course, bravest of the brave, as all heroes are; but, unlike other heroes, he was as compassionate as he was brave, and a man of great intellect as well as great bodily strength. It was natural that the Athenians should have such a hero, because they valued thought and ideas, as no other part of the country did. In Theseus their ideal was embodied. But Hercules embodied what the rest of Greece most valued. His qualities were those the Greeks in general honored and admired. Except for unflinching courage, they were not those that distinguished Theseus. Hercules was the strongest man on earth, and he had the supreme self-confidence magnificent physical strength gives. He considered himself on an equality with the gods.”

The Labours of Hercules (1967)

Notes Toward a Supreme Fiction (1942), It Must Give Pleasure

2010s, 2017, July
Source: Tweet by @realDonaldTrump https://twitter.com/realDonaldTrump/status/889798407228989441 (25 July 2017)

Source: Drenai series, The King Beyond the Gate, Ch. 20
Context: "We irritated him, he told me. Why did he get himself killed for us?" "Because he was a hero. And that is what heroes do. You understand?"

Speech http://hansard.millbanksystems.com/commons/1849/feb/01/address-in-answer-to-the-speech in the House of Commons (1 February 1849).
1840s

Family Leadership Summit 2015, quoted in
2010s, 2015

Gottfried to Jean-Christophe. Part 3: Ada
Variant translation: A hero is one who does what he can. The others don't.
As quoted in A Book of French Quotations‎ (1963) by Norbert Guterman, p. 365
Jean-Christophe (1904 - 1912), Youth (1904)
Context: You are a vain fellow. You want to be a hero. That is why you do such silly things. A hero!... I don't quite know what that is: but, you see, I imagine that a hero is a man who does what he can. The others do not do it.

Epigraph; said of a history teacher who smashed a chair in his excitement when discussing the conqueror
The Inspector General (1836)

"Albert Einstein" in Biographical Memoirs (1980) Vol. 51, National Academy of Sciences.