“Once in one's life, for one mortal moment, one must make a grab for immortality; if not, one has not lived”
Sylvester Stallone, interviewed by Rob Carnevale in " Sylvester Stallone: Rocky Balboa http://www.bbc.co.uk/films/2007/01/15/sylvester_stallone_rocky_balboa_2007_interview.shtml", BBC (28 October 2014).
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Sylvester Stallone 8
American actor, screenwriter, and film director 1946Related quotes

“One must pay dearly for immortality; one has to die several times while one is still alive.”
Man büßt es theuer, unsterblich zu sein: man stirbt dafür mehrere Male bei Lebzeiten.
5
Ecce Homo (1888)

A Few Maxims for the Instruction of the Over-Educated (1894)

Message at Pickfair, Beverly Hills, California (1 June 1932), as quoted in Life Is A Jest (1974) edited by A. K. Hajra <!-- or 6 January? 1932 Me p100-101 -->
General sources
Context: Life becomes meaningful and all activities are purposeful only on the basis of faith in the enduring reality. … The greatest romance possible in life is to discover this Eternal Reality in the midst of infinite change. Once, one has experienced this, one sees oneself in everything that lives, one recognises all of life as his life, everybody's interests as his own. One is no longer bound by habits of the past, no longer swayed by the hopes of the future — One lives in and enjoys each present moment to the full. There is no greater romance in life than this adventure in realization.

“To live a life of truth one has to suffer, but must suffer cheerfully”
Morarji Desai speaks about life and celibacy

“One must not live one's life through men but must be complete on oneself as a woman of substance.”
Source: Bridget Jones's Diary

“One must, in one's life, make a choice between boredom and suffering.”
Letter to Claude Hochet (Summer 1800), quoted in J. Christopher Herold, Mistress to an Age: A Life of Madame de Staël (New York: Grove Press, 1958), p. 223
Herold comments: "Her decision was emphatically in favor of suffering, which after all was a pleasure compared to boredom." (p. 224)
The actual quotation is from a letter from Mme de Staël to Claude Hochet dated October 1, 1800 : «Il faut choisir dans la vie entre l’ennui et le tourment : je donne l’un et l’hiver l’autre» (Germaine de Staël, Correspondance générale. Tome IV. Première partie. Du directoire au Consulat. 1er décembre 1796-15 décembre 1800, texte établi et présenté par Béatrice W. Jasinski, Paris, Chez Jean-Jacques Pauvert, 1976, xii/337 p., p. 326).
Source: The Rise of Endymion (1997), Chapter 32 (p. 665)