"He is no fool who gives what he cannot keep to gain that which he cannot lose."
-Philip James (Jim) Elliot
"One must dig deeply into opposing points of view in order to know whether your own position remains defensible. Iron sharpens iron."
-Francis Collins
"Keep exploring. Keep dreaming. Keep asking why. Don't settle for what you already know."
-Barack Obama
"There is no limit to the amount of good you can do if you don't care who gets the credit."
-Ronald Reagan
"Don't let your doubts just sit there: pursue them and keep after them until you drive them into the ground."
-William Lane Craig
"We choose to go to the Moon in this decade and do the other things, not because they are easy, but because they are hard."
-John Fitzgerald Kennedy
"Go to the ant, you sluggard; consider its ways and be wise! It has no commander, no overseer or ruler, yet it stores its provisions in summer and gathers its food at harvest."
-King Solomon
"The first principle is that you must not fool yourself and you are the easiest person to fool."
-Richard Feynman
"We live on an island surrounded by a sea of ignorance. As our island of knowledge grows, so does the shore of our ignorance."
-John Archibald Wheeler
"No one can make you feel inferior without your consent."