In one sense there will be something difficult even for God — namely, that which He has not done — not because He could not, but because He would not… - Tertullian

Why lean upon a blind guide, if you have eyes of your own? Why be clothed by one who is naked, if you have put on Christ? Why use the shield of another, when the apostle gives you armour of your own? It would be better for him to learn from you to acknowledge the resurrection of the flesh, than for you from him to deny it; because if Christians must needs deny it, it would be sufficient if they did so from their own knowledge, without any instruction from the ignorant multitude.

In his [Plato's] system, then, the souls of the wise are carried up on high into the ether: according to Arius, into the air; according to the Stoics, into the moon. I wonder, indeed, that they abandon to the earth the souls of the unwise, when they affirm that even these are instructed by the wise, so much their superiors. For where is the school where they can have been instructed in the vast space which divides them? By what means can the pupil-souls have resorted to their teachers, when they are parted from each other by so distant an interval?

And so they upbraid the discipline of monogamy with being a heresy; nor is there any other cause whence they find themselves compelled to deny the Paraclete more than the fact that they esteem Him to be the institutor of a novel discipline, and a discipline which they find most harsh: so that this is already the first ground on which we must join issue in a general handling (of the subject), whether there is room for maintaining that the Paraclete has taught any such thing as can either be charged with novelty, in opposition to catholic tradition, or with burdensomeness, in opposition to the “light burden” of the Lord.