They faithfully reflect the spirit of the age in which they were born, a period of strife and conflict. The strident note that often appears in Luther's hymns can easily be understood when it is remembered that the great Reformer looked upon the pope as Antichrist himself and all others who opposed the Lutheran teachings as confederates of the devil. In 1541, when the Turkish invasion from the East threatened to devastate all Europe, special days of humiliation and prayer were held throughout Germany. It was for one of these occasions that Luther wrote the hymn, "Lord, keep us steadfast in Thy word." In its original form, however, it was quite different from the hymn we now sing. The first stanza ran: Lord, keep us in Thy word and work, Restrain the murderous pope and Turk, Who fain would tear from off Thy throne Christ Jesus, Thy beloved Son. When Luther, on the other hand, sang of God's free grace to men in Christ Jesus, or extolled the merits of the Saviour, or gave thanks for the word of God restored to men, there was such a marvelous blending of childlike trust, victorious faith and spontaneous joy that all Germany was thrilled by the message. The popularity of the Lutheran hymns was astonishing. Other hymn-writers sprang up in large numbers, printing presses were kept busy, and before Luther's death no less than sixty collections of hymns had been published. Wandering evangelists were often surrounded by excited crowds in the market places, hymns printed on leaflets were distributed, and the whole populace would join in singing the songs of the Reformers. Paul Speratus, Paul Eber, and Justus Jonas were the most gifted co-laborers of Luther. It was Speratus who contributed three hymns to the "Achtliederbuch," the first hymn-book published by Luther. His most famous hymn, "To us salvation now is come," has been called "the poetic counterpart of Luther's preface to the Epistle to the Romans." It was the great confessional hymn of the Reformation. Luther is said to have wept tears of joy when he heard it sung by a street singer outside his window in Wittenberg. Speratus wrote the hymn in a Moravian prison into which he had been cast because of his bold espousal of the Lutheran teachings. Immediately upon his release he proceeded to Wittenberg, where he joined himself to the Reformers. He later became the leader of the Reformation movement in Prussia and before his death in 1551 was chosen bishop of Pomerania. His poetic genius may be seen reflected in the beautiful paraphrase of the Lord's Prayer which forms the concluding two stanzas of his celebrated hymn: All blessing, honor, thanks, and praise To Father, Son, and Spirit, The God who saved us by His grace, All glory to His merit: O Father in the heavens above, Thy glorious works show forth Thy love, Thy worthy Name be hallowed.