A piece written with a distinctive structure, where piano solo sections and unaccompanied vocal sections alternate. The lyrics are by Saint John of the Cross, a prominent poet and leader of 16th-century Spanish Catholicism, with whom Mompou felt a deep affinity. The original poem bears the lengthy title Cantar del alma que se huelga de conocer a Dios por fe (Song of the Soul that Rejoices in Knowing God through Faith). Its content is also extensive, comprising 11 stanzas of three lines each, of which only stanzas 1, 2, 3, 6, 7, and 11 have been set to music. The form is a litany, where each stanza, including those not set to music, concludes with the phrase "aunque es de noche" (even though it is night). The tonality throughout the piece is E minor, and a key signature is also present. The vocal sections lack bar lines and are marked only with the instruction "in the style of Gregorian chant," along with slurs, a few dynamic markings, and ritardandos. Although church modes are not employed, each syllable of the text is assigned a single eighth note, creating the impression of a recitation directly transformed into song. The piano solo sections are marked Lento and feature lyrical melodies and chromatic harmonies. However, they somewhat evoke Baroque-era organ chorales, and overall, many Christian musical elements are discernible. Indeed, Mompou was interested in monastic life and left behind several religious compositions. However, considering that the word "God" is deliberately omitted from the title here, it is possible that he was seeking a more universal spiritual realm rather than a specific religion.