'Thou shalt not kill' does not apply to murder of one's own kind only, but to all living beings and this commandment was inscribed in the human breast long before it was proclaimed from Sinai.
Leo TolstoyAnd Levin, a happy father and a man in perfect health, was several times so near suicide that he hid the cord, lest he be tempted to hang himself, and was afraid to go out with his gun, for fear of shooting himself. But Levin did not shoot himself, and did not hang himself; he went on living.
Leo Tolstoy