If I am wicked, Nature compels me to be wicked, and the freedom which virtue is supposed to give is not possible for me.
 Bertrand Russell, A History of Western Philosophy (1945). copy citation

Context

“If virtue is the sole good, there can be no reason against cruelty and injustice, since, as the Stoics are never tired of pointing out, cruelty and injustice afford the sufferer the best opportunities for the exercise of virtue. If the world is completely deterministic, natural laws will decide whether I shall be virtuous or not. If I am wicked, Nature compels me to be wicked, and the freedom which virtue is supposed to give is not possible for me. To a modern mind, it is difficult to feel enthusiastic about a virtuous life if nothing is going to be achieved by it. We admire a medical man who risks his life in an epidemic of plague, because we think illness is an evil, and we hope to diminish its frequency.” source