To "know thyself" must mean to know the malignancy of one's own instincts and to know, as well, one's power to deflect it.
Karl A. MenningerTO THOSE WHO WOULD USE INTELLIGENCE IN THE BATTLE AGAINST DEATH - TO STRENGTHEN THE WILL TO LIVE AGAINST THE WISH TO DIE, AND TO REPLACE WITH LOVE THE BLIND COMPULSION TO GIVE HOSTAGES TO HATRED AS THE PRICE OF LIVING.
Karl A. Menninger