See this legally free ebook:

  • A Manual of the History of Dogmas, Volume 1: The Development of Dogmas during the Patristic Age, 100-869, Third Edition, by Rev. Bernard John Otten, S.J. (St. Louis, London: B. Herder, 1922). With Imprimatur. May be read online and available in pdf, epub, daisy, djvu, kindle/mobi, and text formats at Internet Archive and Internet Archive (2nd copy).

On the Memorial of St. Basil the Great, Bishop of Caesarea Mazaca, and St. Gregory of Nazianzus (Nazianzen) in the Latin church (2 January in the Ordinary Form of the Roman Rite) and in the Maronite church (1 January). For other legally free ebooks, you may access the List of Free eBooks (Arranged by Title) and the List of Free eBooks (Grouped by Subject). All ye holy Bishops and Confessors, pray for us. All ye holy Doctors, pray for us, to the greater glory of God!

“I have still much to say to you, but it is beyond your reach as yet. It will be for him, the truth-giving Spirit, when he comes, to guide you into all truth. He will not utter a message of his own; he will utter the message that has been given to him; and he will make plain to you what is still to come. And he will bring honour to me, because it is from me that he will derive what he makes plain to you. I say that he will derive from me what he makes plain to you, because all that belongs to the Father belongs to me.” (St. John 16:12-15)