Nothing is more seductive for man than his freedom of conscience, but nothing is a greater cause of suffering.
 Fyodor Dostoyevsky, The Brothers Karamazov (1880). copy citation

Context

“But what happened? Instead of taking men's freedom from them, Thou didst make it greater than ever! Didst Thou forget that man prefers peace, and even death, to freedom of choice in the knowledge of good and evil? Nothing is more seductive for man than his freedom of conscience, but nothing is a greater cause of suffering. And behold, instead of giving a firm foundation for setting the conscience of man at rest for ever, Thou didst choose all that is exceptional, vague and enigmatic; Thou didst choose what was utterly beyond the strength of men, acting as though Thou didst not love them at all—Thou who didst come to give Thy life for them!” source