12 Faith burns with passionate ardour; the burden of silence is intolerable, and my thoughts imperiously demand an utterance. Already, in the preceding book I have departed from the intended method of my demonstration. I was denouncing that blasphemous sense in which the heretics speak of One God, and expounding the passages in which Moses speaks of God and God. I hastened on with a precipitate, though devout, zeal to the true sense in which we hold the unity of God. And now again, wrapped up in the pursuit of another enquiry, I have suffered myself to wander from the course, and, while I was engaged upon the true Divinity of the Son, the ardour of my soul has hurried me on before the time to make the confession of true God as Father and as Son. But our own faith must wait its proper place in the treatise. This preliminary statement of it has been made as a safeguard for the reader; it shall be so developed and explained hereafter as to frustrate the schemes of the gainsayer.
Source: On the Trinity (New Advent)