“One was kind, out of a bounty that could hardly be exhausted, to old governesses and gardeners, who could be relied upon to give thanks with proper abjection; one performed public duties, for which one was paid in full by deference; one was chaste, refusing to run away from one's husband with other men who for the most part did not ask one to do so, and who in any case had nothing better to offer than one's own home. Knowing no difficulties one was without fortitude; knowing no criteria but one's own achievements one was without taste.”

Gorgias

Niemand ist so beflissen, immer neue Eindrücke zu sammeln, als derjenige, der die alten nicht zu verarbeiten versteht.
Source: Aphorisms (1880/1893), p. 61.

Un jour
Un jour je m'attendais moi-même
Je me disais Guillaume il est temps que tu viennes
Pour que je sache enfin celui-là que je suis
Moi qui connais les autres
"Cortège", line 19; translation from Roger Shattuck (trans.) Selected Writings of Guillaume Apollinaire (New York: New Directions, 1971) p. 75.
Alcools (1912)

Source: All That Matters (1922), p.90 - The One in Ten, final stanza.

The Education of Henry Adams (1907)

Source: Missionaries in India, 1994

In a report in 1792 - Goya wrote to the Academy of San Fernando, on 'teaching art'; as quoted in Francisco Goya y Licientis, Janis Tomlinson, Phaodon 1999, p. 70
1790s

Ibn Maja, 2313 http://ahadith.co.uk/permalink-hadith-9685
Sunni Hadith