Source: The Christian Agnostic (1965), p.77-78, (Paul Tillich: The Shaking of the Foundations. 1963. Pelican Books. p. 164
“Perhaps the word for the feeling I mean is serenity, a high acceptance, a recognition that Heracleitus's doctrine of eternal flow is a great truth, and while we may not, in ourselves, find the moment when the one element changes into the other, that moment will come and the consciousness of its inevitability may give us courage in adversity, and balance in good fortune.”
Opera and Humour (1991)
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Robertson Davies 282
Canadian journalist, playwright, professor, critic, and nov… 1913–1995Related quotes

Niebuhr's preferred form, as declared by his widow
The Serenity Prayer (c. 1942)
Variant: God, give us grace to accept with serenity the things that cannot be changed, courage to change the things which should be changed, and the wisdom to distinguish the one from the other.

Full version of the original (ca. 1942)
The Serenity Prayer (c. 1942)
Source: Make Me an Instrument of Your Peace: Living in the Spirit of the Prayer of St. Francis
Source: Living systems, 1978, p. 22; As cited in: Egolfs Voldemars Bakuzis (1974) Foundations of Forest Ecosystems: Concepts of systems in general. p. 490