(a) Physical Welfare. Benevolent wishes may be unlimited, for they do not imply doing anything. But the case is more difficult with benevolent action, especially when this is to be done, not from friendly inclination (love) to others, but from duty, at the expense of the sacrifice and mortification of many of our appetites. That this beneficence is a duty results from this: that since our self-love cannot be separated from the need to be loved by others (to obtain help from them in case of necessity), we therefore make ourselves an end for others; and this maxim can never be obligatory except by having the specific character of a universal law, and consequently by means of a will that we should also make others our ends. Hence the happiness of others is an end that is also a duty.

I am only bound then to sacrifice to others a part of my welfare without hope of recompense: because it is my duty, and it is impossible to assign definite limits how far that may go. Much depends on what would be the true want of each according to his own feelings, and it must be left to each to determine this for himself. For that one should sacrifice his own happiness, his true wants, in order to promote that of others, would be a self-contradictory maxim if made a universal law. This duty, therefore, is only indeterminate; it has a certain latitude within which one may do more or less without our being able to assign its limits definitely. The law holds only for the maxims, not for definite actions.

(b) Moral well-being of others (salus moral is) also belongs to the happiness of others, which it is our duty to promote, but only a negative duty. The pain that a man feels from remorse of conscience, although its origin is moral, is yet in its operation physical, like grief, fear, and every other diseased condition. To take care that he should not be deservedly smitten by this inward reproach is not indeed my duty but his business; nevertheless, it is my duty to do nothing which by the nature of man might seduce him to that for which his conscience may hereafter torment him, that is, it is my duty not to give him occasion of stumbling. But there are no definite limits within which this care for the moral satisfaction of others must be kept; therefore it involves only an indeterminate obligation.

IX. What is a Duty of Virtue? uJDRsyqTVshVGHX1UUaNKFnE4QDkcuN0nkTrUJsylkNX3J/ZAnqU6WFfA9T+41lN