xi A SYNTHETIC PHILOSOPHY OF LIVING 399
the way in which, once a truth has emerged in this manner, it seeks to dominate the whole landscape. Somehow these truths must be made to live together, for a truth which wants to kill all the other members of its family when it comes to the throne invariably turns into falsehood. It is against this that the synthetic mind has to be on its guard.
All scientific endeavour culminates in the effort of psychology to throw light upon the causal activity of man, to understand how his thinking, his planning, his striving, are in some degree successful in attaining his goals and in realizing his desires. The task of psychology is to render his thinking and striving more successful, to give them greater causal efficacy. In spite of all its discoveries, however, it remains one branch of scientific investigation among many others, and does not pretend to provide mankind with a completed philosophy, destructive as it may seem of already existing philosophies. Freud himself makes no attempt to pass beyond the strict limits of what is permitted to research. In a lecture on Weltanschauung which has been translated, ' Philosophy of Life ', he says, * Psychoanalysis is not, in my opinion, in a position to create a Weltanschauung of its own. It has no need to do so, for it is a branch of science and can subscribe to the scientific Weltanschauung*ll (p. 232). Nevertheless, it is the business of philosophy to absorb psychology and at the same time to adapt itself to its findings wherever they conflict with its preconceived ideas just as it does in the case of any other science. An illustration of this is the way in which a well-known ethical principle such as that which is expressed in the Kantian formula, ' I ought, therefore I can ', has to be reconstructed in view of the teachings of psychology. Dr. W. Brown prefers to reverse it (without, of course, denying it) and to say