The Gay Science. Friedrich Nietzsche

Am I created for the purpose of discovering new truths? There are already too many of the old ones."

      26.

      What is Living?—Living—that is to continually eliminate from ourselves what is about to die; Living—that is to be cruel and inexorable towards all that becomes weak and old in ourselves, and not only in ourselves. Living—that means, therefore, to be without piety toward the dying, the wretched and the old? To be continually a murderer?—And yet old Moses said: "Thou shalt not kill!"