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Man needs variation even in his daily life, and for his perfect development must not give all his thoughts to one thing. In this day of specialism there is grave danger lest we should be absorbed by a single duty. If a man allows himself to be entirely taken up by his business or daily labour, he may become more successful in that one direction than his neighbour, but he is a worse man than he who has some variation, and his faculties suffer a serious limitation. We want variety, and we must have it.