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 (c) Natural acts are performed by man's faculties unaided by divine grace; supernatural, by the help of God's grace.

(d) Good actions are conformed to the rules of morality; bad actions are contrary to them; those that are indifferent may be good or bad according to circumstances.

(e) Valid acts are such as have all the conditions requisite, and so produce their effect; invalid acts are destitute of some condition necessary to produce their effect.