Every glance at the world, to explain which is the task of the philosopher, confirms and proves that _will to live_, far from being an arbitrary hypostasis or an empty word, is the only true expression of its inmost nature. Everything presses and strives towards _existence_, if possible _organised existence_, _i.e._, _life_, and after that to the highest possible grade of it. In animal nature it then becomes apparent that _will to live_ is the keynote of its being, its one unchangeable and unconditioned quality. Let any one consider this universal desire for life, let him see the infinite willingness, facility, and exuberance with which the will to live presses impetuously into existence under a million forms everywhere and at every moment, by means of fructification and of germs, nay, when these are wanting, by means of _generatio æquivoca_, seizing every opportunity, eagerly grasping for itself every material capable of life: and then again let him cast a glance at its fearful alarm and wild rebellion when in any particular phenomenon it must pass out of existence; especially when this takes place with distinct consciousness. Then it is precisely the same as if in this single phenomenon the whole world would be annihilated for ever, and the whole being of this threatened living thing is at once transformed into the most desperate struggle against death and resistance to it. Look, for example, at the incredible anxiety of a man in danger of his life, the rapid and serious participation in this of every witness of it, and the boundless rejoicing at his deliverance. Look at the rigid terror with which a sentence of death is heard, the profound awe with which we regard the preparations for carrying it out, and the heartrending compassion which seizes us at the execution itself. We would then suppose there was something quite different in question than a few less years of an empty, sad existence, embittered by troubles of every kind, and always uncertain: we would rather be amazed that it was a matter of any consequence whether one attained a few years earlier to the place where after an ephemeral existence he has billions of years to be. In such phenomena, then, it becomes visible that I am right in declaring that _the will to live_ is that which cannot be further explained, but lies at the foundation of all explanations, and that this, far from being an empty word, like the absolute, the infinite, the idea, and similar expressions, is the most real thing we know, nay, the kernel of reality itself.