Nature is schoolmistress, the soul the pupil; and whatever one has taught or the other has learned has come from God - the Teacher of the teacher.
TertullianBut all the other frenzies of passions-impious both toward the bodies and toward the sexes-beyond the laws of nature, we banish not only from the threshold, but from all shelter of the Church, because they are not sins, but monstrosities.
TertullianOfferings to propitiate the dead then were regarded as belonging to the class of funeral sacrifices, and these are idolatry. Idolatry, in fact, is a sort of homage to the departed, the one as well as the other is a service to dead men. Moreover, demons dwell in the images of the dead. ... this sort of exhibition has passed from honors of the dead to honors of the living; I mean, to quaestorships [financial overseers]and magistractes, to priestly offices of different kinds. Yet, since idolatry still cleaves to the dignity's name, whatever is done in its name partakes of its impurity.
Tertullian