If it be a sin to doubt Catholic dogma, how can you weigh evidence for and against? St. Paul tells us to prove all things.

To admit that Christ is God, and then to doubt an exact statement of His teaching is certainly a sin, for that implies a denial either of His knowledge or of His veracity. But we do not need to doubt a thing before we can begin to study it I do not doubt the fact that the earth moves round the sun, yet I am perfectly free to weigh all the evidence for or against that proposition. St. Paul believed in the dogma of the Trinity, yet he could not prove that dogma save by proving that God had revealed it and that it must be accepted on God’s authority.

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty