These are the opinions of the author whose cause I defend. I lay them down, not to enforce them upon others by disputation, but as an account of his proceedings. On them he acts; and from them he is convinced that neither he, nor any man, or number of men, have a right (except what necessity, which is out of and above all rule, rather imposes than bestows) to free themselves from that primary engagement into which every man born into a community as much contracts by his being born into it as he contracts an obligation to certain parents by his having been derived from their bodies. The place of every man determines his duty. If you ask, _Quem te Deus esse jussit_? you will be answered when you resolve this other question, _Humana qua parte locatus es in re_?[22] I admit, indeed, that in morals, as in all things else, difficulties will sometimes occur. Duties will sometimes cross one another. Then questions will arise, which of them is to be placed in subordination? which of them may be entirely superseded? These doubts give rise to that part of moral science called _casuistry_, which though necessary to be well studied by those who would become expert in that learning, who aim at becoming what I think Cicero somewhere calls _artifices officiorum_, it requires a very solid and discriminating judgment, great modesty and caution, and much sobriety of mind in the handling; else there is a danger that it may totally subvert those offices which it is its object only to methodize and reconcile. Duties, at their extreme bounds, are drawn very fine, so as to become almost evanescent. In that state some shade of doubt will always rest on these questions, when they are pursued with great subtilty. But the very habit of stating these extreme cases is not very laudable or safe; because, in general, it is not right to turn our duties into doubts. They are imposed to govern our conduct, not to exercise our ingenuity; and therefore our opinions about them ought not to be in a state of fluctuation, but steady, sure, and resolved.