“Poverty is a virtue which one can teach oneself.”

iv. 32a. 11
Quotes by and about Diogenes

Chère amie, ne savez-vous pas que la vertu est un état de guerre, et que, pour y vivre, on a toujours quelque combat à rendre contre soi?
Julie ou la Nouvelle Héloïse http://fr.wikisource.org/wiki/Julie_ou_la_Nouvelle_H%C3%A9lo%C3%AFse/Sixi%C3%A8me_partie#Lettre_VII._R.C3.A9ponse (French), Sixième partie, Lettre VII Réponse (1761)
Julie, or The New Heloise http://books.google.com/books?id=oN6_B_AFhcwC (English), Part Six, Letter VII Response, pg 560

Source: The Absolutely True Diary of a Part-Time Indian

Ocean of Wisdom: Guidelines for Living (1989) ISBN 094066609X
Unsourced variant: In the practice of tolerance, one's enemy is the best teacher.

Source: The God Delusion (2006), p. 152 of the Black Swan paperback edition of 2007

The word translated "strange teachings" means literally another end [of textile]. There are two different understandings about "strange teachings" or heretical. One possible understanding is "strange from the authentic teaching", another understanding is simply different subjects, just as two authors or two scholastic fields literature and politics.
Source: The Analects, Chapter II

Source: Zen and the Art of Motorcycle Maintenance (1974), Ch. 29

22 August 1875.
The Walk With God (1919)

2:2 <!-- p. 625 -->
Church Dogmatics (1932–1968)
Context: The saving of anyone is something which is not in the power of man, but only of God. No one can be saved — in virtue of what he can do. Everyone can be saved — in virtue of what God can do. The divine claim takes the form that it puts both the obedient and the disobedient together and compels them to realise this, to recognise their common status in face of the commanding God.