Tertullian

“ We are the same to emperors as to our ordinary neighbors. For we are equally forbidden to wish ill, to do ill, to speak ill, to think ill of all men. The thing we must not do to an emperor, we must not do to any one else: what we would not do to anybody, a fortiori, perhaps we should not do to him whom God has been pleased so highly to exalt. ”

“ We may be at once Romans and foes of Rome, when men passing for Romans are discovered to be enemies of their country. So the affection, and fealty, and reverence, due to the emperors do not consist in such tokens of homage as these, which even hostility may be zealous in performing, chiefly as a cloak to its purposes; but in those ways which Deity as certainly enjoins on us, as they are held to be necessary in the case of all men as well as emperors. Deeds of true heart-goodness are not due by us to emperors alone. We never do good with respect of persons ”