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Teaching of John A. McHugh, O.P. and Charles J. Callan, O.P.

“If a person is not able to remove one or more important objections against his judgment, his opinion has not become moral certitude, and he may not follow it as a safe guide”.

“Those who act when their state of mind is doubt, suspicion, or uncertain opinion: are (a) guilty of sin, for they so not act in good faith (Rom. xiv, 22, 23), and they are imprudent and lovers of danger (Ecclus. iii. 27); (b) guilty of the species and gravity of sin which they fear may be in their act; for they interpretatively wish that to which they expose themselves”.

“Fears against an opinion are important, when they are not merely possible, but have such an appearance of truth that even a prudent man would consider them as worthy of support”.

Extrinsic signs of solid probability are the good authorities by whom the contrary of the opinion is defended”.

John A. McHugh, O.P. and Charles J. Callan, O.P., Moral Theology A Complete Course, , Vol. 1. New York City, Joseph F. Wagner, Inc., 1960

PDF of source: here.

Some works written in French about opinion, assent, etc: