Whether one man is bound to obey another? St. Thomas

I answer that, Just as the actions of natural things proceed from natural powers, so do human actions proceed from the human will. On natural things it behooved the higher to move the lower to their actions by the excellence of the natural power bestowed on them by God: and so in human affairs also the higher must move the lower by their will in virtue of a divinely established authority. Now to move by reason and will is to command. Wherefore just as in virtue of the divinely established natural order the lower natural things need to be subject to the movement of the higher, so too in human affairs, in virtue of the order of natural and divine law, inferiors are bound to obey their superiors.