The Triumph of Life, Love, and Being

In a monastical village, a monk and a nun to-be exchange notes, via the books they send back and forth, for illustration and editing, they noting the forbidden knowledge therein. Thus begins their relationship, although they have not met in person. They soon meet, in a crypt, after the monk finds the key to opening the secret door to the nunnery, and there the loving escalates. When the monastical village burns to the ground, they embark on a picaresque journey, in which they employ their wisdom, encountering various and sundry situations, while walking ever onward through a landscape of forests, flowers, mountains, and deserts.
They carry a special, speaking, book that they salvaged from the monastery's library, from which they live what is written, but, really, must live or witness it, truly, before it can be written as fact. It is, well, a different kind of book/movie; self-help, I suppose. One more thing: they speak in rhyme.