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Eyes are something we focus on in other people, so it's no surprise that they are always cropping up in love poetry. You know the old saying, "The eyes are the windows of the soul"? Well, that's just the kind of frequently used phrase that our speaker doesn't have much time for.
Line 1: We start out with the speaker refusing to compare his lover's eyes to the sun. He picks a really out-there, exaggerated simile so that we can see just how silly this kind of comparison can be. So really, this is a negative simile: "x is not like y."