633. We cannot apply the rule of good and evil, what we might call reciprocity and solidarity, to the personal conduct of human beings in relation to themselves. Can we find the rule of conduct in natural law along with a safe guide?
“When you eat too much, it harms you. Well then, that is God letting you know what is necessary for you and when exceed that measure, you are punished. It is the same with everything else. Natural law establishes the limit of each person’s needs, and when the limit is exceeded the resulting suffering serves as atonement for the infraction. If humankind listened to the voice that says ‘enough!’ they would avoid most of the troubles and misfortunes that they blame on nature.”