Human beings yield in many situations, even important and spiritual and central ones, as long as it prolongs one's well-being.
Source: In Macmillan Dictionary of Quotations, by John Daintith, 1989.
-- Alexander Solzhenitsyn, (Dec 11 1918-2008), Russian novelist; He is well known for his books describing forced labor camps, e.g., One Day in the Life of Ivan Denisovich, 1962.