It must be confessed, that by the weakness and indiscretion of busy (or at best, of well-meaning) people, as well as by the malice of those who are enemies to all revealed religion, and are not content to possess their own infidelity in silence, without communicating it to the disturbance of mankind; I say, by these means, it must be confessed, that the doctrine of the Trinity hath suffered very much, and made Christianity suffer along with it. For these two things must be granted: First, that men of wicked lives would be very glad there were no truth in Christianity at all; and secondly, if they can pick out any one single article in the Christian religion which appears not agreeable to their own corrupted reason, or to the arguments of those bad people, who follow the trade of seducing others, they presently conclude, that the truth of the whole Gospel must sink along with that one article; which is just as wise, as if a man should say, because he dislikes one law of his country, he will therefore observe no law at all; and yet, that one law may be very reasonable in itself, although he does not allow it, or does not know the reason of the law-givers.
Thus it hath happened with the great doctrine of the Trinity; which word is indeed not in the Scripture, but was a term of art invented in the earlier times to express the doctrine by a single word, for the sake of brevity and convenience. The doctrine then, as delivered in Holy Scripture, although not exactly in the same words, is very short, and amounts only to this, that the Father, the Son, and the Holy Ghost, are each of them God, and yet there is but one God. For, as to the word Person, when we say there are three Persons; and as to those other explanations in the Athanasian Creed this day read to you (whether compiled by Athanasius or no) they were taken up three hundred years after Christ, to expound this doctrine; and I will tell you upon what occasion. About that time there sprang up a heresy of a people called Arians, from one Arius the leader of them. These denied our Saviour to be God, although they allowed all the rest of the Gospel (wherein they were more sincere than their followers among us). Thus the Christian world was divided into two parts, until at length, by the zeal and courage of St Athanasius, the Arians were condemned in a general council, and a creed formed upon the true faith, as St Athanasius hath settled it. This creed is now read at certain times in our churches, which, although it is useful for edification to those who understand it; yet, since it containeth some nice and philosophical points which few people can comprehend, the bulk of mankind is obliged to believe no more than the Scripture doctrine, as I have delivered it. Because that creed was intended only as an answer to the Arians in their own way, who were very subtle disputers.