I've seen various redactions of his famous meditation on trust in God. Here's quite a short one published in Fr Vincent Ferrer Blehl's "A Newman Prayer Book" which I picked up recently at Littlemore:
God has created me to do Him some definite service; He has committed some work to me which He has not committed to another.
I have my mission - I may never know it in this life,
but I shall be told it in the next.
I am a link in a chain, a bond of connection between persons.
He has not created me for naught. I shall do good, I shall do His work;
I shall be a preacher of Truth in my own place, while not intending it, if I do but keep His commandments and serve Him in my calling.
Therefore, my God, I will put myself without reserve into your hands. What have I in heaven, and apart from you what do I want upon earth?
My flesh and my heart fail, but God is the God of my heart,
and my portion for ever.