And not yet acquainted with the word, according to which he has believed and works, and not able to give a reason in himself. "Prove all things "the apostle says, "and hold fast that which is good"
Prove all things. That is, examine prophecies whether they be true, and the doctrine which you hear from new preachers, and refrain yourselves not only from evil, but from every thing that hath the appearance of evil, and which may disedify and scandalize others. (Witham)
Hold that which is good. This we can best learn from the doctrine of the apostles, and the spirit of the Catholic Church. Men can deceive and be deceived, but the Spirit of God, speaking to us by his Church, can neither deceive us nor be deceived.
I received this vision as being what was in accordance with the apostolic word, which thus urges all who are endowed with greater virtue, "Be ye skilful money-changers."
Who exchange their creed for heresy; although they contrariously interpret his words to their own side, when he says in another passage, "Prove all things; hold fast that which is good; ".
Let that, accordingly, be to you Scripture, and Nature, and Discipline, which you shall find to have been sanctioned by God; just as you are bidden to "examine all things, and diligently follow whatever is better."