Ante-Nicene Fathers, Vol III:
Tertullian: Part I: Chapter XLIII.

Chapter XLIII.

I will confess, however, without hesitation, that there are some who in a sense may complain of Christians that they are a sterile race:  as, for instance, pimps, and panders, and bath-suppliers; assassins, and poisoners, and sorcerers; soothsayers, too, diviners, and astrologers. But it is a noble fruit of Christians, that they have no fruits for such as these.  And yet, whatever loss your interests suffer from the religion we profess, the protection you have from us makes amply up for it. What value do you set on persons, I do not here urge who deliver you from demons, I do not urge who for your sakes present prayers before the throne of the true God, for perhaps you have no belief in that—but from whom you can have nothing to fear?