Why did Lope de Vega use different verse forms in the same play?

Lope de Vega utilized a variety of verse forms within his plays to reflect changing moods and situations, aiming to enhance the lyricism of his drama.1

In his poetic treatise, Arte nuevo de hacer comedias en este tiempo, Vega explicitly rejected rigid Neoclassical rules in favor of metrical variety. By employing different verse structures, he sought to maintain the audience's engagement, adhering to the principle that the dramatist's primary duty is to satisfy the public, which he considered the ultimate arbiter of taste. This approach allowed his work to function as a "national" drama, capable of mirroring the diverse emotional responses and social values of the Spanish consciousness.12