“If anyone is crazy enough to want to kill a president of the United States, he can do it. All he must be prepared to do is give his life for the president's.”

“We see past time in a telescope and present time in a microscope. Hence the apparent enormities of the present.”

“It is more shameful to distrust our friends than to be deceived by them.”

“I am only one; but still I am one. I cannot do everything; but still I can do something. I will not refuse to do the something I can do.”

“Intelligence is the ability to avoid doing work, yet getting the work done.”

“Dream as if you'll live forever. Live as if you'll die today.”