Tolstoy searches in science, philosophy, wisdom and reason and finds no answer to convince him that life is worth living. Science answers many questions, but not the one that obsesses him. He sees too that meaning does not lie in something superadded to life: possessions, achievements, honours, awards. Those are externalities, gift-wrapping, not life itself. The answer that eventually came to Tolstoy was religious faith. 'No matter what answers faith may give, its every answer gives to the finite existence of man the sense of the infinite—a sense which is not destroyed by suffering, privation or death.' Faith, he said is a force of life. 'If a man lives, then he must believe in something.' If that something is finite, it will not ultimately satisfy him, since everything finite eventually perishes. The only thing worth believing in is the infinite. And, 'Without faith it is impossible to live.'
-Rabbi Jonathan Sacks, The Great Partnership: Science, Religion, and the Search for Meaning