How far Olavus Petri had imbibed the spirit of Luther is reflected not only by the fiery zeal with which he proclaimed the doctrines of the Reformation in Sweden, but also in the character of his hymns. "Our Father, merciful and good" is so strongly suggestive of Luther's style that it was regarded for a long time as a translation of one of Luther's hymns. It is now known that there is no such hymn of German origin. Most of Petri's hymns, however, are translations of German or Latin originals. One of these is the beautiful Advent hymn: Now hail we our Redeemer, Eternal Son of God, Born in the flesh to save us, And cleanse us in His blood. The Morning Star ascendeth, Light to the world He lendeth, Our Guide in grief and gloom. Although this hymn was translated by Petri from the German, it is believed that it dates back to a Latin hymn by Ambrose in the fourth century. Another of Latin origin is the glad Easter hymn: Blest Easter day, what joy is thine! We praise, dear Lord, Thy Name divine, For Thou hast triumphed o'er the tomb; No more we need to dread its gloom. Petri, like Luther, never ceased praising God for restoring His Word to the Church through the Reformation. This may be seen in one of his more polemic hymns, which is regarded as original. A translation by Ernst W. Olson reads: Thy sacred Word, O Lord, of old Was veiled about and darkened, And in its stead were legends told, To which the people harkened; Thy Word, for which the people yearned, The worldlings kept in hiding, And into human fables turned Thy truth, the all-abiding. Now thanks and praise be to our Lord, Who boundless grace bestoweth, And daily through the sacred Word His precious gifts forthshoweth. His Word is come to light again, A trusty lamp to guide us; No strange and divers teachings then Bewilder and divide us. The last hymn-book published by Olavus Petri appeared in 1536. It contained some thirty new hymns, most of them translations from German sources. In addition to his labors in the realm of hymnody, Petri must also be credited with the authorship of the Swedish Church-Book, which appeared in 1529. He was the creator of the liturgy of the Church of Sweden. His hymnological endeavors were continued by his brother Laurentius, who, as archbishop, brought out in 1567, and later in 1572, the most important of all the earlier hymn-books of the Swedish Church. Laurentius is sometimes given the title, "Father of Swedish hymnody," but the honor more rightly belongs to his older brother, Olavus.