“Be not, O Greeks, so very hostilely disposed towards the Barbarians. To the Babylonians you owe astronomy; to the Persians, magic; to the Egyptians, geometry; to the Phoeicians, instruction by alphabetic writing. Cease, then, to miscall these imitations inventions of your own. Orpheus, again, taught you poetry and song; from him, too, you learned the mysteries.”

Cubism was born

14 August 1853
Correspondence, Letters to Madame Louise Colet

Source: Demian (1919), p. 181
Context: You, too, have mysteries of your own. I know that you must have dreams that you don't tell me. I don't want to know them. But I can tell you: live those dreams, play with them, build altars to them. It is not yet the ideal but it points in the right direction. Whether you and I and a few others will renew the world someday remains to be seen. But within ourselves we must renew it each day, otherwise we just aren't serious. Don't forget that!

"Eric Johnson's Guitar Gets to Austin's Roots" at NPR (13 August 2005) http://www.wbur.org/npr/4795689&ft=3&f=15403510

De Resurrectione Carnis [Of the Resurrection of Flesh] Ch.1 as quoted in The Writings of Tertullian, Vol.2 http://books.google.com/books?id=nlcPAQAAMAAJ Tr. Peter Holmes, as contained in Ante-Nicene Christian Library: Translations of the Writings of the Fathers down to AD 325 Vol.15 (1870)

Source: Mathematics and the Physical World (1959), p. 59

Source: 1960s, The Gutenberg Galaxy (1962), p. 66

10
Essays, Can Poetry Matter? (1991), Poetry as Enchantment (2015)

Reported in Hoyt's New Cyclopedia Of Practical Quotations (1922), p. 86. The quotation has been attributed to many others, such as Lord Chief Justice Campbell, Lord Chesterfield, Sir William Harcourt, Lord Pembroke, Lord Westbury, and to an anonymous judge, and said to have been spoken in court to Garter King at Arms, Rouge Dragon Pursuivant, or some other high-ranking herald, who had confused a "bend" with a "bar" or had demanded fees to which he was not entitled. George Bernard Shaw quotes it in Pygmalion (1912) in the form, "The silly people dont [sic] know their own silly business."

Maule cannot be the original source of the quotation, as it is quoted nearly twenty years before his birth in Charles Jenner's The Placid Man: Or, The Memoirs of Sir Charles Beville (1770): "Sir Harry Clayton ... was perhaps far better qualified to have written a Peerage of England than Garter King at Arms, or Rouge Dragon, or any of those parti-coloured officers of the court of honor, who, as a great man complained on a late solemnity, are but too often so silly as not to know their own silly business." "Old Lord Pembroke" (Henry Herbert, 9th Earl of Pembroke) is said by Horace Walpole (in a letter of May 28, 1774 to the Rev. William Cole) to have directed the quip, "Thou silly fellow! Thou dost not know thy own silly business," at John Anstis, Garter King at Arms (though in his 1833 edition of Walpole's letters to Sir Horace Mann, George Agar-Ellis, 1st Baron Dover, attributes the saying to Lord Chesterfield in a footnote, in the form "You foolish man, you do not understand your own foolish business"). Edmund Burke also quotes it ("'Silly man, that dost not know thy own silly trade!' was once well said: but the trade here is not silly.") in a "Speech in the Impeachment of Warren Hastings, Esq." on May 7, 1789 (when Maule was just over a year old). Chesterfield or Pembroke fit best in point of time.
Attributed