“The only real failure in life is not to be true to the best one knows.”
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Gautama Buddha 121
philosopher, reformer and the founder of Buddhism -563–-483 BCRelated quotes

“True love is rare, and it's the only thing that gives life real meaning.”
Source: Message in a Bottle

Letters on Tactics (April 1917) http://www.marxists.org/archive/lenin/works/1917/apr/x01.htm; Collected Works, Vol. 24.
1910s

John 17:3 http://wol.jw.org/en/wol/b/r1/lp-e/nwt/E/2013/43/17#h=115:287-115:408, New World Translation of the Holy Scriptures
Gospel of John