Tertullian

“ The name of piety is more grateful than the name of power; so the heads of families are called fathers rather than lords. Far less should the emperor have the name of God. We can only profess our belief that he is that by the most unworthy, nay, a fatal flattery; it is just as if, having an emperor, you call another by the name, in which case will you not give great and unappeasable offence to him who actually reigns?—an offence he, too, needs to fear on whom you have bestowed the title. Give all reverence to God, if you wish Him to be propitious to the emperor. ”

“ If such adulation is not ashamed of its lie, in addressing a man as divine, let it have some dread at least of the evil omen which it bears. It is the invocation of a curse, to give Cæsar the name of god before his apotheosis. ”