I found this poem by Gerhard Tersteegen (unknown translator) in The Christian Book of Mystical Verse, edited by A. W. Tozer (Harrisburg, PA: Christian Publications, 1963).

O past and gone!
How great is God! how small am I!
A mote in the illimitable sky,
Amidst the glory deep, and wide, and high
Of Heaven's unclouded sun.
There to forget myself for evermore;
Lost, swallowed up in Love's immensity,
The sea that knows no sounding and no shore,
God only there, not I.

More near than I unto myself cna be,
Art thou to me;
So have I lost myself in finding Thee,
Have lost myself for ever, O my Sun!
The boundless Heaven of Thine eternal love
Around me, and beneath me, and above;
In glory of that golden day
The former things are passed away--
I, past and gone.