Tertullian

“ We are peers in soul, not in discipline; fellow-possessors of the world, not of error. But if we have no right of communion in matters of this kind with strangers, how far more wicked to celebrate them among brethren! ”

“ But, however, the majority (of Christians) have by this time induced the belief in their mind that it is pardonable if at any time they do what the heathen do, for fear “the Name be blasphemed.” Now the blasphemy which must quite be shunned by us in every way is, I take it, this: If any of us lead a heathen into blasphemy with good cause, either by fraud, or by injury, or by contumely, or any other matter of worthy complaint, in which “the Name” is deservedly impugned, so that the Lord, too, be deservedly angry. ”

“ Where there is the intercourse of life, which the apostle concedes, there is sinning, which no one permits. To live with heathens is lawful, to die with them [7] is not. Let us live with all; [8] let us be glad with them, out of community of nature, not of superstition. ”