“Whoever wants to be a leader should educate himself before educating others. Before preaching to others he should first practice himself. Whoever educates himself and improves his own morals is superior to the man who tries to teach and train others.”
Nahj al-Balagha
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Ali 124
cousin and son-in-law of the Islamic prophet Muhammad 601–661Related quotes

“Whoever is concerned about his education should be on his guard against propaganda.”
Source: The Meaning of a Liberal Education (1926), p. 45

“The lover of education labors first of all to educate himself.”
Source: Aphorisms and Reflections (1901), p. 180

“A man should build a house with his own hands before he calls himself an engineer.”
One Day in the Life of Ivan Denisovich (1962)

The Ayn Rand Column ‘Introducing Objectivism’

“He that would govern others, first should be the master of himself.”
The Bondman (1623), Act I, scene iii http://books.google.com/books?id=K0cNAQAAMAAJ&q=%22He+that+would+govern+others+first+should+be+the+master+of+himself%22&pg=PA193#v=onepage.

Source: A Global Perspective: a Conversation With the Apostolic Nuncio, Archbishop Christophe Pierre https://www.thecatholictelegraph.com/a-global-perspective-a-conversation-with-the-apostolic-nuncio-archbishop-christophe-pierre/71427 (3 March 2021)

Alan Simpson (b. 1912), on becoming president of Vassar College, as quoted in Newsweek (1 July 1963)
Misattributed

Ein Künstler ist, wer sein Centrum in sich selbst hat. Wem es da fehlt, der muss einen bestimmten Führer und Mittler ausser sich wählen.
“Ideas,” Lucinde and the Fragments, P. Firchow, trans. (1991), § 45