“The cracks in old friendships are measured in awkward pauses.”

Source: Anam Cara: A Book of Celtic Wisdom

Source: City of Heavenly Fire

"The Wit of Porportuk" in The Best Short Stories of Jack London (1962) ISBN 0-449-30053-6

Source: Catch-22

from Records of Tennyson, Ruskin, Browning by Anne Thackeray Ritchie http://www.victorianweb.org/books/aplin.html (Harper and Brothers, New York, 1893) page 170
Other letters, notebooks, journal articles, recollected statements

The Aquarian Conspiracy (1980), Chapter Twelve, Human Connections: Relationships Changing

Book XL, sec. 46
History of Rome

We the People interview (1996)
Context: Friendship in the Greek tradition, in the Roman tradition, in the old tradition, was always viewed as the highest point which virtue can reach. Virtue, meaning here, "the habitual facility of doing the good thing," which is fostered by what the Greeks called politaea, political life, community life. I know it was a political life in which I wouldn't have liked to participate, with the slaves around and with the women excluded, but I still have to go to Plato or to Cicero. They conceived of friendship as a supreme flowering, of the interaction which happens in a good political society.

Source: Eat, Pray, Love