PUER NOBIS is a melody from a fifteenth-century manuscript from Trier. However, the tune probably dates from an earlier time and may even have folk roots. PUER NOBIS was altered in Spangenberg's Christliches Gesangbüchlein (1568), in Petri's famous Piae Cantiones (1582), and again in Praetorius's Musae Sioniae (Part VI, 1609), which is the basis for the triple-meter version used in the 1987 Psalter Hymnal. Another form of the tune in duple meter is usually called PUER NOBIS NASCITUR. The tune name is taken from the incipit of the original Latin Christmas text, which was translated into German by the mid-sixteenth century as "Uns ist geborn ein Kindelein," and later in English as "Unto Us a Boy Is Born." The harmonization is from the 1902 edition of George R. Woodward's Cowley Carol Book.

Yet this I call to mind
and therefore I have hope:
Because of the Lord’s great love
we are not consumed,
for his compassions never fail.
They are new every morning;
great is your faithfulness.
I say to myself, “The Lord is my portion;
therefore I will wait for him.”
The Lord is good to those
whose hope is in him,
to the one who seeks him;
it is good to wait quietly
for the salvation of the Lord.

Ambrose (b. Treves, Germany, 340; d. Milan, Italy, 397), one of the great Latin church fathers, is remembered best for his preaching, his struggle against the Arian heresy, and his introduction of metrical and antiphonal singing into the Western church. Ambrose was trained in legal studies and distinguished himself in a civic career, becoming a consul in Northern Italy. When the bishop of Milan, an Arian, died in 374, the people demanded that Ambrose, who was not ordained or even baptized, become the bishop. He was promptly baptized and ordained, and he remained bishop of Milan until his death. Ambrose successfully resisted the Arian heresy and the attempts of the Roman emperors to dominate the church. His most famous convert and disciple was Augustine. Of the many hymns sometimes attributed to Ambrose, only a handful are thought to be authentic.

Born into a staunchly Lutheran family, Michael Praetorius (b. Creuzburg, Germany, February 15, 1571; d. Wolfenbüttel, Germany, February 15, 1621) was educated at the University of Frankfort-an-der-Oder. In 1595 he began a long association with Duke Heinrich Julius of Brunswick, when he was appointed court organist and later music director and secretary. The duke resided in Wolfenbüttel, and Praetorius spent much of his time at the court there, eventually establishing his own residence in Wolfenbüttel as well. When the duke died, Praetorius officially retained his position, but he spent long periods of time engaged in various musical appointments in Dresden, Magdeburg, and Halle. Praetorius produced a prodigious amount of music and music theory. His church music consists of over one thousand titles, including the sixteen-volume Musae Sionae (1605-1612), which contains Lutheran hymns in settings ranging from two voices to multiple choirs. His Syntagma Musicum (1614-1619) is a veritable encyclopedia of music and includes valuable information about the musical instruments of his time.

Educated at Caius College in Cambridge, England, George R. Woodward (b. Birkenhead, Cheshire, England, 1848; d. Highgate, London, England, 1934) was ordained in the Church of England in 1874. He served in six parishes in London, Norfolk, and Suffolk. He was a gifted linguist and translator of a large number of hymns from Greek, Latin, and German. But Woodward's theory of translation was a rigid one—he held that the translation ought to reproduce the meter and rhyme scheme of the original as well as its contents. This practice did not always produce singable hymns; his translations are therefore used more often today as valuable resources than as congregational hymns. With Charles Wood he published three series of The Cowley Carol Book (1901, 1902, 1919), two editions of Songs of Syon (1904, 1910), An Italian Carol Book (1920), and the Cambridge Carol Book (1924). Much of the unfamiliar music introduced in The English Hymnal (1906) resulted from Woodward's research. He also produced an edition of the Piae Cantiones of 1582 (1910) and published a number of his translations in Hymns of the Greek Church (1922).