A pilgrim, guided by a classical poet, ascends a mountain where souls undergo ordered purgation on terraces corresponding to specific vices—pride, envy, anger, sloth, avarice, gluttony, and lust—and gradually receive purification through symbolic sufferings, prayers, visions, and moral instruction. Along the way he meets repentant figures, engages in debates about love, poetry, and political corruption, experiences allegorical dreams, and witnesses ritual cleansings at sacred springs that restore memory and charity. The journey reaches a terrestrial paradise where the guide departs and a heavenly beloved returns, prompting confession, renewal of virtue, and the pilgrim’s readiness for the final ascent toward the divine.