Wherever one finds oneself inclined to bitterness, it is a sign of emotional failure: a larger heart, and a greater self-restraint, would put a calm autumnal sadness in the place of the instinctive outcry of pain.
Source, in full
The Collected Papers of Bertrand Russell: Contemplation and Action, 1902-1914, ed. Richard A. Rempel, Andrew Brink and Margaret Moran (Routledge, 1993, ISBN 0-415-10462-9: Textual Notes, p. 555; also in Laurence J. Peter Quotations for our time (1978), p. 188