And ever is there something new
Devised to change Thy doctrines true;
Lord Jesus! as Thou still dost reign,
These vain, presumptuous minds restrain;
And as the cause and glory, Lord,
Are Thine, not ours, do Thou afford
Us help and strength and constancy,
And keep us ever true to Thee.
They are hymn stanzas by Nikolaus Selnecker, but I'm yet to find the full hymn (perhaps a reader knows it? maybe it appeared in this translation in a 20th C. hymnal of the Missouri Synod or Preus's old "little Norwegian synod" Update - hymn found!). I've known of Selnecker to date only as one of the authors of the Formula of Concord and an early representative of Lutheran orthodoxy, but he was evidently a hymn writer and church musician as well. From Wiki: "Nikolaus Selnecker (or Selneccer) (December 5, 1532, Hersbruck – May 24, 1592, Leipzig) was a German musician and theologian. He is now known mainly as a hymn writer. He is also known as one of the principal authors of the Formula of Concord along with Jakob Andreä and Martin Chemnitz.
At a young age he was an organist in Nuremberg. He studied under Melanchthon at the University of Wittenberg, graduating M. A. in 1554. Later he was a court preacher and musician at Dresden."
Georg Mylius, a Wittenberg professor, had this to say about him at his funeral, “He was not a weathervane or a rubberneck on the doctrine of the Christian religion, nor was he a reed, which the wind blows here and there, nor a man in impressible clothing, who would let himself be moved to all changes in religious matters for the sake of lordly favor and worldly glory, but he has remained true and faithful to a simply known and confessed truth during his lifetime and continues till his death.”
Diberlius. Realencyklopaedie. P.187, courtesy the biography at Studium Excitare.