Secondly, if it be a law that obliges only some condition of men, or one particular man, and be not written, nor published by word, then also it is a law of Nature; and known by the same arguments and signs that distinguish those in such a condition from other subjects. For whatsoever law is not written, or some way published by him that makes it law, can be known no way, but by the reason of him that is to obey it; and is therefore also a law not only civil, but natural. For example, if the sovereign employ a public minister, without written instructions what to do; he is obliged to take for instructions the dictates of reason; as if he make a judge, the judge is to take notice that his sentence ought to be according to the reason of his sovereign, which being always understood to be equity, he is bound to it by the law of Nature: or if an ambassador, he is, in all things not contained in his written instructions, to take for instruction that which reason dictates to be most conducing to his sovereign’s interest; and so of all other ministers of the sovereignty, public and private. All which instructions of natural reason may be comprehended under one name of “fidelity”; which is a branch of natural justice.