Context

These lines open Browning's famous Sonnet 43. It's about love (aren't they all?), and the speaker starts by listing the many ways in which she loves...thee (i.e., the person her poem is addressed to)

It's pretty straightforward, and she doesn't seem to be throwing any curveballs, so we'll leave it at that.

Where you've heard it

Guess what: Shakespeare didn't write this.

But usually, when people quote it—which is, like, all the time—they think he did.

Pretentious Factor

If you were to drop this quote at a dinner party, would you get an in-unison "awww" or would everyone roll their eyes and never invite you back? Here it is, on a scale of 1-10.

Yes, the poem ueses the pronoun "thee." And yes, the word soul is thrown around—along with ideas large enough to be capitalized.

That might sound pretty pretentious, but you have to keep in mind that the poem is a love letter. It's hard to call someone pretentious because of how much love they have. 

Just make sure you're not addressing this quote to yourself and you'll be fine.