Whatever the conditions under which a child grows up, he will, if not mentally defective, learn to cope with others in one way or another and he will probably acquire some skills. But there are also forces in him which he cannot acquire or even develop by learning. You need not, and in fact cannot, teach an acorn to grow into an oak tree, but when given a chance, its intrinsic potentialities will develop. Similarly, the human individual, given a chance, tends to develop his particular human potentialities. He will develop then the unique alive forces of his real self: the clarity and depth of his own feelings, thoughts, wishes, interests; the ability to tap his own resources, the strength of his will power; the special capacities or gifts he may have; the faculty to express himself, and to relate himself to others with his spontaneous feelings. All this will in time enable him to find his set of values and his aims in life. In short, he will grow, substantially undiverted, toward self-realization.
Karen Horney, Neurosis and Human Growth: The Struggle Toward Self-Realization (New York: W. W. Norton, 1950), 17.