To man nature has given none of the perfect animal equipments for self-preservation and self-defence which she has bestowed on others of her creatures. But she has given to him reason and freedom of will, and has determined that through these faculties and without the aid of instinct he shall win for himself a complete development of his capacities and natural endowments. It is, says Kant, no happy life that nature has marked out for man. He is filled with desires which he can never satisfy. His life is one of endeavour and not of attainment: not even the consciousness of the well-fought battle is his, for the struggle is more or less an unconscious one, the end unseen. Only in the race, and not in the individual, can the natural capacities of the human species reach full development. Reason, says Kant, (Prop. 2, _op. cit._) “does not itself work by instinct, but requires experiments, exercise and instruction in order to advance gradually from one stage of insight to another. Hence each individual man would necessarily have to live an enormous length of time, in order to learn by himself how to make a complete use of all his natural endowments. Or, if nature should have given him but a short lease of life, as is actually the case, reason would then require an almost interminable series of generations, the one handing down its enlightenment to the other, in order that the seeds she has sown in our species may be brought at last to a stage of development which is in perfect accordance with her design.” Man the individual shall travel towards the land of promise and fight for its possession, but not he, nor his children, nor his children’s children shall inherit the land. “Only the latest comers can have the good fortune of inhabiting the dwelling which the long series of their predecessors have toiled—though,” adds Kant, “without any conscious intent—to build up without even the possibility of participating in the happiness which they were preparing.” (Proposition 3.)