The Kingdom of God is Within You by Leo Tolstoy Chapter 12 Page 87

And there can only be a semblance of ethics in which murder in the shape of war and the execution of criminals is allowed, but no true ethics.

The recognition of the life of every man as sacred is the first and only basis of all ethics.

The doctrine of an eye for an eye and a tooth for a tooth has been abrogated by Christianity, because it is the justification of immorality, and a mere semblance of equity, and has no real meaning. Life is a value which has no weight nor size, and cannot be compared to any other, and so there is no sense in destroying a life for a life. Besides, every social law aims at the amelioration of man's life. What way, then, can the annihilation of the life of some men ameliorate men's life? Annihilation of life cannot be a means of the amelioration of life; it is a suicidal act.