The opening line ‘How do I love thee?’ suggests an intimate conversation between lovers.
‘Depth’, ‘breadth’ and ‘height’ are weighty concepts which suggest her love is comprehensive and allows her to reach impossible extremes.
Poem of comparisons –‘Most quiet need’ and ‘men strive for Right’ are two very different ideas. One is simple and one is complex showing the intensity of her feelings.
Replaced her faith in God with her love for her husband – ‘lost saints’.
‘I love thee better after death’ suggests even death will not part them. Their love is eternal.