For an allusion to accomplish its purpose it must refer to a widely known story or piece of art.
Sonnet 43 uses both repetition and variety to intensify meaning.
There are several lines that begin "I love thee..." While these lines begin in the same way (repetition), the rest of the line varies.
For example, I love thee freely...I love the purely...etc. In these lines, EBB is able to discuss the many dimensions of her deep love. Her love has many sides to it, as the repetition and variety explain.
I’m pretty positive it’s b
