Probabilism
In spite of all this, it may happen that all our pains and inquiries do not lead us to certainty, that solid reasons are found both for and against the existence of an obligation: under these circumstances, a conscientious man will naturally ask whether he must consider himself bound by the law or whether he can, by further reflections -- reflex principles, as they are called -- come to the plain conclusion that there is no obligation either to do or to omit the act in question. Were we obliged to consider ourselves bound in every doubt, the result, obviously, would be an intolerable severity. But since before performing an action the final verdict of our conscience must be free from doubt, the necessity of removing in one way or another such doubts as may have arisen, is self-evident.
Look up Moral Theology in Addis and Arnold
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