Duties towards ourselves must, just as all others, be based either on right or on love. Duties towards ourselves based on right are impossible, because of the self-evident fundamental principle _volenti non fit injuria_ (where the will assents, no injury is done). For what I do is always what I will; consequently also what I do to myself is never anything but what I will, therefore it cannot be unjust. Next, as regards duties towards ourselves based on love. Ethics here finds her work already done, and comes too late. The impossibility of violating the duty of self-love is at once assumed by the first law of Christian Morals: "Love thy neighbour as thyself." According to this, the love which each man cherishes for himself is postulated as the _maximum_, and as the condition of all other love; while the converse, "Love thyself as thy neighbour" is never added; for every one would feel that the latter does not claim enough. Moreover, self-love would be the sole duty regularly involving an _opus supererogationis_. Kant himself says in the _Metaphysische Anfangsgründe zur Tugendlehre_, p. 13 (R., p. 230): "That which each man inevitably wills of himself, does not belong to the conception of Duty." This idea of duties towards ourselves is nevertheless still held in repute, indeed it enjoys for the most part special favour; nor need we feel surprise. But it has an amusing effect in cases where people begin to show anxiety about their persons, and talk quite earnestly of the duty of self-preservation; the while it is sufficiently clear that fear will lend them legs soon enough, and that they have no need of any law of duty to help them along. First among the duties towards ourselves is generally placed that of not committing suicide, the line of argument taken being extremely prejudiced and resting on the shallowest basis. Unlike animals, man is not only a prey to =bodily= pain limited to the passing moment, but also to those incomparably greater =mental= sufferings, which, reaching forwards and backwards, draw upon the future and the past; and nature, by way of compensation, has granted to man alone the privilege of being able to end his life at his own pleasure, before she herself sets a term to it; thus, while animals necessarily live so long as they can, man need only live so long as he =will=.