And it is an obvious fact, which cannot be called in question, that the principal element in a man's well-being,—indeed, in the whole tenor of his existence,—is what he is made of, his inner constitution. For this is the immediate source of that inward satisfaction or dissatisfaction resulting from the sum total of his sensations, desires and thoughts; whilst his surroundings, on the other hand, exert only a mediate or indirect influence upon him. This is why the same external events or circumstances affect no two people alike; even with perfectly similar surroundings every one lives in a
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