Answer:
Simile.
Step-by-step explanation:
Simile is a literary technique employed by writers in making comparisons of their points with something of another kind. These two compared things will not be of the same kind, and the comparison will make the intended meaning more clear.
Sonnets are poems written in a romantic manner, for the lover to show his/her appreciation and feelings of love for the beloved. Elizabeth Barrett Browning's "Sonnet 43" is one such sonnet, written for her husband Robert Browning. This poem uses a number of literary techniques like hyperbole and simile among others. The given lines are from the 7th and 8th lines of the poem. These lines uses simile to compare the love the author/speaker has for her husband. The comparison is between her love and human's right and praise.