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Borís Pasternak 40
Russian writer 1890–1960Related quotes

Not by Twain, but from Edward Abbey's A Voice Crying In The Wilderness (1989).
Misattributed

“The best way to prepare for life is to begin to live.”

“we can not prepare for defeat and expect to live a life in Victory.”

In a public lecture at Bangalore in 1934, from [Singh, R, 2010, Letters to the Editor: Indian scientists vs. science and religion, http://www.scienceandculture-isna.org/july-aug10/Letter%20to%20editors.pdf, Science and Culture, 76, 7-8, 206]

“Tomorrow will be like today. Life wastes itself whilst we are preparing to live.”
1840s, Essays: First Series (1841), Prudence

“No man is born unto himself alone;
Who lives unto himself, he lives to none.”
Esther (1621), Sec. 1, Meditation 1.