3 What am I then about? See: The Son came separately in the Man; The Holy Spirit descended separately from heaven in the form of a Dove; The Voice of the Father sounded separately out of heaven, “This is My Son.” Where then is this inseparable Trinity? God has made you attentive by my words. Pray for me, and open, as it were, the folds of your hearts, and may He grant you wherewith your hearts so opened may be filled. Share my travail with me. For you see what I have undertaken; and not only what, but who I am that have undertaken it, and of what I wish to speak, and where and what my position is, even in that “body which is corruptible, and presses down the soul, and the earthly habitation weighs down the mind that muses upon many things.” When therefore I abstract my mind from the multiplicity of things, and gather it up into the One God, the inseparable Trinity, that so I may see something which I may say of it, think ye that in this “body which presses down the soul,” I shall be able to say (in order that I may speak to you something worthy of the subject), “O Lord, I have lifted up my soul unto You.” May He assist me, may He lift it up with me. For I am too infirm in respect of Him, and He in respect of me is too mighty.
Source: Sermons on Selected Lessons of the New Testament (New Advent)