The fact is certain because it is impossible.

But 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.

Prevention of birth is premature murder, and it makes no difference whether it is a life already born that one snatches away or a life that is coming to birth.

You cannot parcel out freedom in pieces because freedom is all or nothing.

Offerings 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.

It is not consistent with truth that a man should sacrifice half of his stomach only to God-that he should be sober in drinking, but intemperate in eating. Your belly is your God, your liver is your temple, your paunch is your altar, the cook is your priest, and the fat steam is your Holy Spirit; the seasonings and the sauces are your chrisms, and your belchings are your prophesizing...[such] a grossly- feeding Christian is akin to lions and wolves rather than God. Our Lord Jesus called Himself Truth and not habit.

I believe BECAUSE it's impossible.