Here are some quotes from Jim Elliot in the book (which was written by his wife):
"A man is no fool who gives up what he cannot keep in order to gain what he cannot lose."
"When it comes time to die, make sure that all you have left to do is die."
"Wherever you are. Be all there."
"Live to the hilt every situation you believe to be the will of God."
Read these again. Let them sink it.