And first, if it be a law that obliges all the subjects without exception, and is not written, nor otherwise published in such places as they may take notice thereof, it is a law of nature. For whatsoever men are to take knowledge of for law, not upon other men’s words, but every one from his own reason, must be such as is agreeable to the reason of all men; which no law can be, but the law of nature. The laws of nature therefore need not any publishing, nor proclamation; as being contained in this one sentence, approved by all the world, _Do not that to another, which thou thinkest unreasonable to be done by another to thyself_. 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.