Sonnet 43 - Langauge

Use of assonance - 'Praise' 'Faith' - striking because the poem is about defining the perfect love and yet the poem itself avoids perfection. This may be deliberate to suggest that even though the poems finds their love perfect, it in fact goes against conventions (eloped marriage to Robert). May suggest that her feelings for Rovert are unique. 

Anaphora- 'I love thee...' - reflects the devotion of her love and its persistent nature. Also makes the poem seem more like a prayer than a sonnet.

Repetition - 'depth and breadth and height' - to suggest the poem is comprehensive; it aims to fully define the poet's love. The use of triple here also suggests breathlessness and excitement.

Rhetorical question - 'How…