1. The next point is to investigate as briefly as possible the subject of the Holy Spirit. All who perceive, in whatever manner, the existence of Providence, confess that God, who created and disposed all things, is unbegotten, and recognise Him as the parent of the universe. Now, that to Him belongs a Son, is a statement not made by us only; although it may seem a sufficiently marvellous and incredible assertion to those who have a reputation as philosophers among Greeks and Barbarians, by some of whom, however, an idea of His existence seems to have been entertained, in their acknowledging that all things were created by the word or reason of God. We, however, in conformity with our belief in that doctrine, which we assuredly hold to be divinely inspired, believe that it is possible in no other way to explain and bring within the reach of human knowledge this higher and diviner reason as the Son of God, than by means of those Scriptures alone which were inspired by the Holy Spirit, _i.e._ the gospels and epistles, and the law and the prophets, according to the declaration of Christ Himself. Of the existence of the Holy Spirit no one indeed could entertain any suspicion, save those who were familiar with the law and the prophets, or those who profess a belief in Christ. For although no one is able to speak with certainty of God the Father, it is nevertheless possible for some knowledge of Him to be gained by means of the visible creation and the natural feelings of the human mind; and it is possible, moreover, for such knowledge to be confirmed from the sacred Scriptures. But with respect to the Son of God, although no one knoweth the Son save the Father, yet it is from sacred Scripture also that the human mind is taught how to think of the Son; and that not only from the New, but also from the Old Testament, by means of those things which, although done by the saints, are figuratively referred to Christ, and from which both His divine nature, and that human nature which was assumed by Him, may be discovered.