attitude
“Hope makes a good breakfast. Eat plenty of it.”
“What man actually needs is not a tensionless state but rather the striving and struggling for a worthwhile goal.”
“I have often been downcast, but never in despair.”
“What do you care what other people think?”
“Stay hungry, stay foolish.”
“The greatest discovery of my generation is that a human being can alter his life by altering his attitudes.”
“Act as if what you do makes a difference. It does.”
“Everything can be taken from a man but one thing: the last of the human freedoms — to choose one's attitude in any given set of circumstances.”