St. Clement[43] there enjoins obedience within the Christian body, referring to the discipline of the Roman army, in these terms: "Let us take service, therefore, brethren, with all earnestness in His faultless ordinances. Let us mark the soldiers that take service under our rulers, how exactly, how readily, how submissively, they execute the orders given them. All are not prefects, nor rulers of thousands, nor rulers of hundreds, nor rulers of fifties, and so forth; but each man in his own rank executeth the order given by the emperor and his commanders. The great without the small cannot exist, neither the small without the great. There is a certain mixture in all things, and therein is utility. Let us take our body as an example. The head without the feet is nothing, so likewise the feet without the head are nothing; even the smallest limbs of our body are necessary and useful for the whole body; but all the members conspire and unite in subjection, that the whole body may be saved. So, in our case, let the whole body be saved in Christ Jesus, and let each man be subject unto his neighbour, according as also he was appointed with his special grace. "Forasmuch, then, as these things are manifest beforehand, and we have searched into the depths of the divine knowledge, we ought to do all things in order, as many as the Master[44] has commanded us to perform at their appointed seasons. Now the offerings and liturgic[45] acts He commanded to be performed with care, and not to be done rashly or in disorder, but at fixed times and seasons. And where and by whom He would have them performed He himself fixed by His supreme will, that all things being done with piety, according to His good pleasure, might be acceptable to His will. They, therefore, that make their offerings at the appointed seasons are acceptable and blessed; for while they follow the institutions of the Master they cannot go wrong. For unto the high priest his proper liturgic acts are assigned, and to the priests their proper office is appointed, and upon the levites their proper ministrations are laid. The layman is bound by the layman's ordinances. "Let each of you, brethren, in his own rank give thanks to God, maintaining a good conscience, and not transgressing the appointed rule of his service, but acting with all seemliness. Not in every place, brethren, are the continual daily sacrifices offered, or the free-will offerings, or the sin-offerings and the trespass-offerings, but in Jerusalem alone. And even there the offering is not made in every place, but before the sanctuary in the court of the altar, and this too through the high priest and the aforesaid officiants, after that the victim to be offered has been inspected for blemishes. They then who do anything contrary to the seemly ordinance of His will receive death as the penalty. You see, brethren, in proportion as greater knowledge has been vouchsafed to us, so much the more are we exposed to danger.