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 There can, of course, be no final knowledge of human beings and their difficulties, no complete acquaintance with them. Seldom are the depths of personality plumbed, seldom are all experiences disclosed. Personal characteristics, a man's plans for himself, resources, setting, and background, are merely categories under which one can assemble at any given time the facts which he possesses about a man. They make possible a tentative diagnosis, a diagnosis of the situation as it presents itself to-day. To-morrow it may be altered by additional facts; for unlike materials and machines people are forever changing and forever new.

The great essential in arriving at an appreciation of men and women is to remember that all information about human beings is relative and must ever be subject to revision. Then, and then only, are we prepared successfully to apply the four categories that have been described, and thereby to achieve the knowledge and the understanding of other people which are necessary to the helping of them out of trouble.