William James

"The greatest discovery of my generation is that human beings can alter their lives by altering their attitudes of mind."

"The greatest discovery of my generation is that man can alter his life simply by altering his attitude of mind"

"We forget that every good that is worth possessing must be paid for in strokes of daily effort."

"It is our attitude at the beginning of a difficult task which, more than anything else, will affect its successful outcome."

"The deepest craving of human nature is the need to be appreciated."