War should be the only study of a prince. He should consider peace only as a breathing-time, which gives him leisure to contrive, and furnishes as ability to execute, military plans.
We should never hesitate to use military force, and I will not, as president, in order to keep the American people safe. But we have to use our military wisely. And we did not use our military wisely in Iraq.
Mankind are in the end always governed by superiority of intellectual faculties, and none are more sensible of this than the military profession. When, on my return from Italy, I assumed the dress of the Institute, and associated with men of science, I knew what I was doing: I was sure of not being misunderstood by the lowest drummer boy in the army.
We're certain there are people that can't stand what America stands for... We're certain there are madmen in this world, and there's terror, and there's missiles and I'm certain of this, too: I'm certain to maintain the peace, we better have a military of high morale, and I'm certain that under this administration, morale in the military is dangerously low.
I feel a special kinship for our military. Because, unfortunately, I became a wartime president. And committed our military in the defense of our country to difficult assignments. I tell people all the time, I don't miss much about being president; I do miss looking in the eyes of people who volunteered to serve. And so not only do I feel a kinship, I feel an obligation and a duty to help.
We will continue to deepen our engagement using every element of American power - diplomacy, military, economic development, the power of our values and our ideals.
It must be thoroughly understood that the lost land will never be won back by solemn appeals to the God, nor by hopes in any League of Nations, but only by the force of arms.
America must always lead on the world stage. If we don't, no one else will. The military that you have joined is, and always will be, the backbone of that leadership. But U.S. military action cannot be the only - or even primary - component of our leadership in every instance. Just because we have the best hammer does not mean that every problem is a nail.
I hold it to be of great prudence for men to abstain from threats and insulting words towards any one, for neither the one nor the other in any way diminishes the strength of the enemy; but the one makes him more cautious, and the other increases his hatred of you, and makes him more persevering in his efforts to injure you