Before the Reformation, singing hymns is only done by monks and the trained choir. Since Martin Luther (1483-1546) advocated that everyone could use his or her own mother tongue which they are familiar with to praise the Lord, the congregation could pray freely and sing to respond to God. Therefore, the foundation of the German hymns was established. John Julian(1839-1913), the hymn scholar, in his statistics shows that there are at least ten thousand German hymns and among them more than one hundred thousand are often sung in the churches. Most of the hymns were written during the Thirty Years of War. To the poet of "the golden age of German hymn", Georg Neumark's experience (1621-1681), and the comforting strength of his hymn "If thou but suffer God to guide thee", this paper attempts to explore the background of his composition and the forever-new hope within this hymn based on his deepest belief.