To the question whether then in fact such a world exists as I represent to myself, I can answer nothing certain, nothing which is raised above all doubt, but this: I have assuredly and truly these definite duties which represent themselves to me as duties toward such and such persons, concerning such and such objects. These definite duties I cannot represent to myself otherwise, nor can I execute them otherwise, than as lying within the sphere of such a world as I conceive. Even he who has never thought of his moral destination, if any such there could be, or who, if he has thought about it at all, has never entertained the slightest purpose of ever, in the indefinite future, fulfilling it--even he derives his world of the senses and his belief in the reality of such a world no otherwise than from his idea of a moral world. If he does not comprehend it through the idea of his duties, he certainly does so through the requisition of his rights. What he does not require of himself he yet requires of others, in relation to himself--that they treat him with care and consideration, agreeably to his nature, not as an irrational thing, but as a free and self-subsisting being. And so he is constrained, in order that they may comply with this demand, to think of them also as rational, free, self-subsisting, and independent of the mere force of Nature. And even though he should never propose to himself any other aim in the use and fruition of the objects which surround him than that of enjoying them, he still demands this enjoyment as a right, of which others must leave him in undisturbed possession. Accordingly, he comprehends even the irrational world of the senses through a moral idea. No one who lives a conscious life can renounce these claims to be respected as rational and self-subsisting. And with these claims at least there is connected in his soul a seriousness, an abandonment of doubt, a belief in a reality, if not with the acknowledgment of a moral law in his innermost being. Do but assail him who denies his own moral destination and your existence and the existence of a corporeal world, except in the way of experiment, to try what speculation can do--assail him actively, carry his principles into life, and act as if he either did not exist, or as if he were a piece of rude matter, and he will soon forget the joke; he will become seriously angry with you, he will seriously reprove you for treating him so, and maintain that you ought not and must not do so to him; and, in this way, he will practically admit that you really possess the power of acting upon him, that he exists, that you exist, and that there exists _a medium through which you act upon him_; and that you have at least duties toward him.