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I. BY performing good actions a man becomes a good man morally, and he is a bad man morally if he performs bad actions. Actions are called good or bad morally with reference to the norm or rule of human conduct. So that the morality of an action is its relation to the rule of human conduct. It will be a morally good action if it be conformed to the rule of conduct; otherwise it will be a morally bad action. As men have differed, and do differ, widely in their views as to the meaning of human life and as to man's destiny, they naturally have differed, and do differ, widely in deciding what is the rule of human conduct. The rule in different systems will be progress, or the greatest happiness of the greatest number, or pleasure, or the categorical imperative of the individual reason. Even among Catholic philosophers and divines there is some difference of opinion as to what constitutes the fundamental norm of morality. Practically the different opinions come to much the same, especially as there is greater agreement among Catholics as to what are the formal and proximate rules of morality. The teaching of St Thomas and many others seems to be that the fundamental norm of morality is rational human nature as such. Good in general is that which is conformable to the being whose good it is; and so morally good actions will be such as are conformable to the rational nature of man considered in itself and in all its relations. Man's intellect can know man himself, the existence of God and our relation to him, our relations to other human beings, and to the world round about us; knowing these things, our reason can tell us what actions are becoming and what unbecoming to such a nature. Moreover, reason tells us that although we have the physical liberty to do wrong, we are nevertheless under a moral obligation to abstain from it. Our most wise, and good, and provident Creator, who has given us our nature and placed us in the position which we hold, cannot be indifferent as to