"Health is not an objective condition which can be understood by the methods of natural science alone. It is rather a condition related to the mental attitude by which the individual has to value what is essential for his life."

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Every man gravitates to where he belongs in life, just as surely as water seeks and finds its level. His position is measured precisely by the quality and quantity of the service he renders, plus the mental attitude with which he relates himself to other people.

— Andrew Carnegie