If, on the other hand, there is no belief in a God, it is also impossible to form a conception of the aim, for then the aim, existing in consciousness only as an idea, in the absence of a universal consciousness, has no locus for its existence; there is no place for it in Nature. But if there is no aim, then one cannot ask the question, ‘Wherefore am I alive?’ Then life has not a predetermined aim, but only causes. We have then to concern ourselves only with these causes--at least, with the more proximate, and which are accessible to our examination, since the remote, and especially the first, causes elude our cognition. Our question must then run, ‘Why do we live?’ and we find the answer to it without difficulty. We live, because we stand, like the rest of cognizable Nature, under the universal law of causality. This is a mechanical law, which requires no predetermined plan, and no design, consequently also no universal consciousness. According to this law present phenomena are grounded on the past, not on the future. We live because we are engendered by our parents, because we have received from them a definite measure of force, which makes it possible for us to resist for a given time the influence upon us of Nature’s forces of dissolution. How our life is shaped is determined by the constant interaction of our inherited organic forces and of our environment. Our life is, therefore, objectively viewed, the necessary result of the law-governed activity of the mechanical forces of Nature. Subjectively it includes a quantity of pleasures and pains. We feel as pleasure the satisfaction of our organic impulses, as pain their fruitless struggles for satisfaction. In a sound organism, possessing a high capacity for adaptation, those appetites only attain development, the satisfaction of which is possible--at least, to a certain degree--and is accompanied by no bad consequences for the individual. In such a life pleasure consequently prevails decidedly over pain, and he looks upon existence, not as an evil, but as a great good. In the organism deranged by disease degenerate appetites exist which cannot be satisfied, or of which the gratification injures or destroys the individual, or the degenerate organism is too weak or too inapt to gratify the legitimate impulses. In his life pain necessarily predominates, and he looks upon existence as an evil. My interpretation of the riddle of life is nearly related to the well-known theory of eudæmonism, but it is founded on a biological, not a metaphysical, basis. It explains optimism and pessimism simply as an adequate or inadequate vitality, as the existence or absence of adaptability, as health or illness. Unprejudiced observation of life shows that the whole of mankind stands knowingly or unknowingly at the same philosophical standpoint. Men live willingly, and rather quietly happy than sadly, so long as existence affords them gratification. If the sufferings are stronger than the feeling of pleasure conferred by the satisfaction of the first and most important of all organic impulses--the impulse of life or self-preservation--then they do not hesitate to kill themselves. When Prince Bismarck once said, ‘I do not know why I should bear all the troubles of life, if I were not able to believe in a God and a future life,’ it only shows that he is insufficiently acquainted with the progress of human thought since Hamlet, who raised somewhat the same question. He bears the troubles of life because, and as long as, he can bear them, and he throws them down infallibly at the moment in which his strength is no longer adequate to carry them. The unbeliever lives and is happy, so long as the sweets of life weigh down the scale, and for this reason also the believer, as experience daily teaches, will commit suicide if he sees his balance of life’s account yielding a deficit of satisfaction. The arguments of religion have undoubtedly in the mind of the believer, as have the arguments of duty and honour in the mind of the unbeliever, a convincing force, and must likewise be taken into account as so many assets. Nevertheless they have only a limited, if high value, and can counterbalance their own equivalent of suffering only, and no more.