Robert Motherwell, partly quoting Jean Arp, in Motherwell & black (1981) p. 94 -->
Misattributed
“… it's only on a black day that you begin to have friends.”
Source: The First Circle
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Aleksandr Solzhenitsyn 120
Russian writer 1918–2008Related quotes

“There are no strangers, only friends you have not met yet.”

Pushkin, 19 October 1827.
as quoted in Pushkin, Alexander (2009). Selected Lyric Poetry. Northwestern University Press, p. 121.

Rainy Day Woman, from The Ramblin' Man (1974).
Song lyrics
Source: The Chronicles of Prydain (1964–1968), Book V : The High King (1968), Chapter 21
Context: “Dyrnwyn is yours,” Gwydion said, “as it was meant to be.”
“Yet Arawn is slain,” Taran replied. “Evil is conquered and the blade’s work done.”
“Evil conquered?” said Gwydion. “You have learned much, but learn this last and hardest of lessons. You have conquered only the enchantments of evil. That was the easiest of your tasks, only a beginning, not an ending. Do you believe evil itself so quickly overcome? Not so long as men still hate and slay each other, when greed and anger goad them. Against these even a flaming sword cannot prevail, but only that portion of good in all men’s hearts whose flame can never be quenched.

Gift Of A Friend
Lyrics, Here We Go Again (2009)

“We all have two lives. The second begins when you realize you only have one.”
On the Economic Partnership Agreement (EPA), in Will Ross, " Africans wary of Europe's trade offer http://news.bbc.co.uk/2/hi/africa/7134407.stm", BBC (8 December, 2007).

Hans Arp's quote on drawing on the black surface; as quoted in Search for the Real, Hans Hofmann, Addison Gallery of modern Art, 1948
1940s