In Shakespeare's Sonnets, the speaker's ideas are often complicated by couplets and sententia that do not necessarily reinforce the poems’ lyrical expression. In this study we find that the generic and modal aspects of the poems are often destabilized by two related formal factors that contribute to our understanding of the poems' content: quatrain/couplet structure and interaction of lyric with sententia. In these poems couplets and sententia can provide a sense of certainty and comfort. The reader might expect that the quatrain/couplet structure of couplet closure and the lyric context “reinforced” by sententious statements will help organize the representation of otherwise unstable emotions. However, the consequent uncertainty produced i...