Tertullian

“ Chapter XVII.—Conclusion.
“Old” you are, if we will say the truth, you who are so indulgent to appetite, and justly do you vaunt your “priority:” always do I recognise the savour of Esau, the hunter of wild beasts: so unlimitedly studious are you of catching fieldfares, so do you come from “the field” of your most lax discipline, so faint are you in spirit. ”

“ Men of soul and flesh alone as you are, justly do you reject things spiritual. If the prophets were pleasing to such, my (prophets) they were not. Why, then, do not you constantly preach, “Let us eat and drink, for to-morrow we shall die?” [4] just as we do not hesitate manfully to command, “Let us fast, brethren and sisters, lest to-morrow perchance we die.” Openly let us vindicate our disciplines. Sure we are that “they who are in the flesh cannot please God;” [5] not, of course, those who are in the substance of the flesh, but in the care, the affection, the work, the will, of it. ”

“ To them bodily ambition is suitable to whom bodily strength is necessary; and yet they also strengthen themselves by xerophagies. But ours are other thews and other sinews, just as our contests withal are other; we whose “wrestling is not against flesh and blood, but against the world’s [8] power, against the spiritualities of malice.” Against these it is not by robustness of flesh and blood, but of faith and spirit, that it behoves us to make our antagonistic stand. On the other hand, an over-fed Christian will be more necessary to bears and lions, perchance, than to God ”