Chapter XLIII: Section 2: Reflected in the Normal Conscience

In common with irrational animals we have instincts, appetites, and passions; but, unlike the animals, we have the power to reflect whether an action is right or wrong in itself apart from its consequences. This power of moral judgment is called conscience; and it is conscience which reflects the natural law (the Divine Nature expressed in creation). As conscience, when violated, can and does give rise to an unpleasant feeling of shame in the mind, we have good reason to believe that it exists for the purpose of preventing us from doing shameful actions, just as our eyes are intended, amongst other things, to prevent us from walking over precipices. Moreover, if the conscience is active, instructed, and unbiassed, it will invariably give the correct answer to any question of right or wrong.

It is possible to assert, without fear of contradiction, that no ordinary decent man or woman approaches or begins the practice of artificial birth control without experiencing at first unpleasant feelings of uneasiness, hesitation, repugnance, shame, and remorse. Later on these feelings may be overcome by habit, for the voice of conscience will cease when it has been frequently ignored. This does not alter the fact that at first the natural moral instincts of both men and women do revolt against these practices. To the conscience of mankind birth control is a shameful action.