Rumi's epic masterwork: six books of rhymed couplets containing mystical stories, parables, Sufi philosophy, and digressions so rich they contain worlds within worlds. Where the Divan is lyric intensity, the Masnavi is the great long poem of Islamic mysticism. The reed flute's lament for the reed bed is its most famous image, and one of the most beautiful in all of world literature.

The case for it, the case against, and the rest of the canon open with Pro.