But more. It is true--too true if you will--that all things live on each other. But is it not, therefore, equally true that all things live for each other?--that self-sacrifice, and not selfishness, is at the bottom the law of Nature, as it is the law of Grace; and the law of bio-geology, as it is the law of all religion and virtue worthy of the name? Is it not true that everything has to help something else to live, whether it knows it or not?--that not a plant or an animal can turn again to its dust without giving food and existence to other plants, other animals?--that the very tiger, seemingly the most useless tyrant of all tyrants, is still of use, when, after sending out of the world suddenly, and all but painlessly, many an animal which would without him have starved in misery through a diseased old age, he himself dies, and, in dying, gives, by his own carcase, the means of life and of enjoyment to a thousandfold more living creatures than ever his paws destroyed? And so, the longer one watches the great struggle for existence, the more charitable, the more hopeful, one becomes; as one sees that, consciously or unconsciously, the law of Nature is, after all, self-sacrifice; unconscious in plants and animals, as far as we know; save always those magnificent instances of true self-sacrifice shown by the social insects, by ants, bees, and others, which put to shame by a civilization truly noble--why should I not say divine, for God ordained it?--the selfishness and barbarism of man. But be that as it may, in man the law of self-sacrifice--whether unconscious or not in the animals--rises into consciousness just as far as he is a man; and the crowning lesson of bio- geology may be, when we have worked it out, after all, the lesson of Christmas-tide--of the infinite self-sacrifice of God for man; and Nature as well as religion may say to us--