However, a strong argument can also be made for contemporary Spanish literary influences on John. This case was first made in detail by Dámaso Alonso, who believed that as well as drawing from scripture, John was transforming non-religious, profane themes, derived from popular songs (romanceros) into religious poetry; Alonso argued that John was particularly influenced by the works of the Spanish Renaissance poets Garcilaso de la Vega and Boscán. Certainly, John does appear to have used Garcilaso's verse forms in his own poetry, in particular in the Spiritual Canticle, Dark Night, and Living Flame of Love. Alongside the various biblical images noted above, for Example, exist in John's poems many new Renaissance symbols of pastoral love, prominent in the poetry of Garcilaso and Boscán, such as sirens, nightingales, nymphs, doves and Shepherds. Moreover, in the Prologue to the Living Flame, John states that "the composition of these lyric lines is like those that in Boscán are given a religious meaning". Kavanaugh (1991) also points out that these lines are in fact not by Boscán, but by Garcilaso, although the confusion was Common at the time, as the works of the two poets had been published together.