With the defeat of the Reich and pending the emergence of the Asiatic, the African and, perhaps, the South American nationalisms, there will remain in the world only two Great Powers capable of confronting each other-the United States and Soviet Russia. The laws of both history and geography will compel these two Powers to a trial of strength, either military or in the fields of economics and ideology. (2nd April 1945)
In the military, you learn the essence of people. You see so many examples of self-sacrifice and moral courage. In the rest of life you don't get that many opportunities to be sure of your friends.
If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle.
It will take time to eradicate a cancer like Isil. And any time we take military action, there are risks involved - especially to the servicemen and women who carry out these missions. But I want the American people to understand how this effort will be different from the wars in Iraq and Afghanistan. It will not involve American combat troops fighting on foreign soil.
The best way to fight evil is to do some good. Let me qualify that—the best way to fight evil at home is to do some good. The best way to fight them abroad is to unleash the military.