(from Prescription Against Heretics, c. 197 A.D.)
Now, with regard to this rule of faith–that we may from this point acknowledge what it is which we defend–it is, you must know, that which prescribes the belief that there is one only God, and that He is none other than the Creator of the world, who produced all things out of nothing through His own Word, first of all sent forth; that this Word is called His Son, and, under the name of God, was seen “in diverse manners” by the patriarchs, heard at all times in the prophets, at last brought down by the Spirit and Power of the Father into the Virgin Mary, was made flesh in her womb, and, being born of her, went forth as Jesus Christ; thenceforth He preached the new law and the new promise of the kingdom of heaven, worked miracles; having been crucified, He rose again the third day; (then) having ascended into the heavens, He sat at the right hand of the Father; sent instead of Himself the Power of the Holy Ghost to lead such as believe; will come with glory to take the saints to the enjoyment of everlasting life and of the heavenly promises, and to condemn the wicked to everlasting fire, after the resurrection of both these classes shall have happened, together with the restoration of their flesh.
This rule, as it will be proved, was taught by Christ, and raises amongst ourselves no other questions than those which heresies introduce, and which make men heretics.
So long, however, as its form exists in its proper order, you may seek and discuss as much as you please, and give full rein to your curiosity, in whatever seems to you to hang in doubt, or to be shrouded in obscurity. You have at hand, no doubt, some learned brother gifted with the grace of knowledge, some one of the experienced class, some one of your close acquaintance who is curious like yourself; although with yourself, a seeker he will, after all, be quite aware that it is better for you to remain in ignorance, lest you should come to know what you ought not, because you have acquired the knowledge of what you ought to know. “Thy faith,” He says, “hath saved thee” not observe your skill in the Scriptures.
Now, faith has been deposited in the rule; it has a law, and (in the observance thereof) salvation. Skill, however, consists in curious art, having for its glory simply the readiness that comes from knack. Let such curious art give place to faith; let such glory yield to salvation. At any rate, let them either relinquish their noisiness, or else be quiet. To know nothing in opposition to the rule (of faith), is to know all things.