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.