"I suppose that the number may greatly differ in different individuals," replied Paul. "In individuals of many-sided minds and versatile dispositions, there are, perhaps, more distinct personalities than constitute an individual of less complex character. But how many in either case only God can tell. Who can say? It may be that with every breath which I expire a soul or spiritual impression of myself is sent forth. The universe is large enough even for that. Such may at least be the case in moments of special intensity, when we live, as we say, a year in an hour." They smoked on awhile in silence. Presently Paul said, "When the world comes to recognize the composite character of the individual, that it is composed of not one, but many persons, a new department will be added to ethics, relating to the duties of the successive selves of an individual to one another. It will be recognized, on the one hand, that it is the duty of a man to fulfil all reasonable obligations incurred by his past selves, on the same principle that a pious son fulfils the equitable obligations incurred by a parent. This duty is, indeed, recognized to-day, although not on the correct basis. As regards the ethical relation of a man to the selves who succeed him, a wholly new idea will be introduced. It will be seen that the duty of a man to lead a wise life, to be prudent, to make the most of his powers, to maintain a good name, is not a duty to himself, merely an enlightened selfishness, as it is now called, but a genuine form of altruism, a duty to others, as truly as if those others bore different names instead of succeeding to his name. It will be seen that a man's duty to his later selves is like the duty of a father to his helpless children: to provide for their inheritance, to see that he leaves them a sound body and a good name, if nothing more. It will be perceived that the man who is charitably called 'his own worst enemy,' is not only no better, but worse, than if he were the enemy of his neighbours, because he is blasting coming lives that have a far nearer claim upon him than any neighbour can have. "There will arise, also, in that day, I fancy," said Paul, "some rather delicate questions, as to how far a man may properly bind his future selves by pledges and engagements which he has no means of knowing will meet with their approval, and which may quite possibly prove intolerable yokes to them." "Ah!" exclaimed the doctor, "that is indeed an interesting point. And, meanwhile, I should say the intelligible discussion of these questions will involve a modification in grammatical usage. If we believe that our present selves are distinct persons from our past selves, it is manifestly improper to use the first person in speaking of our past selves. Either the third person must be used, or some new grammatical form invented."