We are alike in many ways, you and I. There is darkness in us. Darkness, pain, death. They radiate from us. If ever you love a woman, Rand, leave her and let her find another. It will be the best gift you can give her.
The quote highlights the shared struggles and darker aspects of human nature between two characters. It suggests that both are burdened by inner turmoil, pain, and the inevitability of death, indicating a deep connection through their shared experiences. This darkness is portrayed as a significant part of their identities, affecting those around them.
Furthermore, the speaker advises Rand on love, positing that his struggles would ultimately harm his romantic partner. By encouraging Rand to let the woman he loves go, the suggestion is that this sacrifice would be an act of kindness, allowing her to seek a happier, unburdened life away from the darkness that surrounds him.