A man to his astonishment all at once becomes conscious of existing after having been in a state of non-existence for many thousands of years, when, presently again, he returns to a state of non-existence for an equally long time. This cannot possibly be true, says the heart; and even the crude mind, after giving the matter its consideration, must have some sort of presentiment of the ideality of time. This ideality of time, together with that of space, is the key to every true system of metaphysics, because it finds room for quite another order of things than is to be found in nature. This is why Kant is so great.
Of every event in our life it is only for a moment that we can say that it is; after that we must say for ever that it was. Every evening makes us poorer by a day. It would probably make us angry to see this short space of time slipping away, if we were not secretly conscious in the furthest depths of our being that the spring of eternity belongs to us, and that in it we are always able to have life renewed.
Reflections of the nature of those above may, indeed, establish the belief that to enjoy the present, and to make this the purpose of one's life, is the greatest wisdom; since it is the present alone that is real, everything else being only the play of thought. But such a purpose might just as well be called the greatest folly, for that which in the next moment exists no more, and vanishes as completely as a dream, can never be worth a serious effort.
Our existence is based solely on the ever-fleeting present. Essentially, therefore, it has to take the form of continual motion without there ever being any possibility of our finding the rest after which we are always striving. It is the same as a man running downhill, who falls if he tries to stop, and it is only by his continuing to run on that he keeps on his legs; it is like a pole balanced on one's finger-tips, or like a planet that would fall into its sun as soon as it stopped hurrying onwards. Hence unrest is the type of existence.
In a world like this, where there is no kind of stability, no possibility of anything lasting, but where everything is thrown into a restless whirlpool of change, where everything hurries on, flies, and is maintained in the balance by a continual advancing and moving, it is impossible to imagine happiness. It cannot dwell where, as Plato says, continual Becoming and never Being is all that takes place. First of all, no man is happy; he strives his whole life long after imaginary happiness, which he seldom attains, and if he does, then it is only to be disillusioned; and as a rule he is shipwrecked in the end and enters the harbour dismasted. Then it is all the same whether he has been happy or unhappy in a life which was made up of a merely ever-changing present and is now at an end.