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.

Bertrand Russell (1872-1970) English mathematician and philosopher

Letter (1903-04-13) to Lucy Donnelly
    (Source)

Collected in his Autobiography, Vol. 1: 1872-1914, ch. 6 "'Principia Mathematica'" (1967).