We are allowed to live with the heathen, but we are not allowed to die with them. Let us live with all men, let us share their joys on the ground of a common humanity, not a common superstition. We are like them in possessing human souls, but not in the way we live. We share the world with them, but not their error.
Tertullian of Carthage (d. 220?), On Idolatry, 14.