Only those who unite scientific knowledge of morality with practice in its application may be trusted to solve promptly and safely problems of conscience. Personal, social, commercial, and political experience proves this abundantly. Moral education requires long, patient, and delicate training, and few acquire it without the aid of casuistry.

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Quote text and notes from Wikiquote: Timothy Brosnahan (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.