We hold that all human desires are evil, and we charge them with sin not in as far as they are natural, but because they are inordinate, and inordinate because nothing pure and upright can proceed from a corrupt and polluted nature.

It is to be distinguished from natural concupiscence, that which God sowed in our nature, such as the concupiscence for food and drink, by which our bodies are nourished.—Evil concupiscence of itself is sin, even if the consent of the will be not added.

Moral corruption fighting against the law, for the crucifying and mortifying of which Christ himself died on the cross, if it be not properly sin, then Scripture has not explained to us what the property of any habitual sin is.

It is illicit, not only to give consent to evil, but also to have an inclination, or propensity to such consent: because all our powers ought to be carried toward the good.

This very thing cannot be conceived, how something by way of an internal habit could be the cause of sin and not be sin. An internal cause inclining to act well is good.