"There was the vers, a simple, early form, which developed into the canso. This was an elaborate poem, of from five to seven stanzas, dealing always with the subject of love, and requiring a melody of its own. On the other hand, from the sirventesc love was properly excluded, and it was written to fit some well-known and popular air. The subject was moral or religious, political or personal. In the planh the poet lamented the death of his patron, or his lady-love. A most curious form was the tenso, a play of wit, in which, usually with great personal bitterness, two poets debated, in alternate stanzas, such questions as: Which are the greater, the benefits or the ills of love? Which contribute most to keep a lover faithful, the eyes or the heart? Which loves the more deeply, one who can not keep from speaking to everyone of his lady, or one who does not speak of her at all, but thinks of her night and day?Such questions of love causistry are thoroughly characteristic of the social element in the troubadour poetry. They are questions of which the knights and ladies seemed never weary."