But, once more alas, our environment is not completely favorable, and there's the rub. That disorderly constellation of instincts and appetites and interests which constitutes the personality of the best of us does not work itself out evenly. At the most favorable, our self-realizations are lopsided and distorted. For every capacity of ours in full play, there are a score at least mutilated, sometimes extirpated, always repressed. They never attain the free fullness of expression which is consciousness, or when they do, they find themselves confronted with an opponent which neutralizes their maturation at every point. Hence, as I have already indicated, they remain in, or revert to, the subterranean regions of our lives, and govern the making of our biographies from their seats below. What they fail to attain in fact they succeed in generating in imagination to compensate for the failure; they realize themselves vicariously. The doctrine of immortality is the generic form of such vicarious self-realization, as frequently by means of dead friends and relatives to whose absolute non-being the mind will not assent, as by means of the everlasting heaven in which the mind may forever disport itself amid those delights it had to forego on earth. Much of the underlying motive of the doctrine is a _sehnsucht_ and nostalgia after the absent dead; little a concern for the continuity of the visible living. And often this passion is so intense that system after system in the philosophic tradition is constructed to satisfy it, and even the most disillusioned of systems--for example, Spinoza's--will preserve its form if not its substance.