Nothing is supernatural. Nothing can be.
Also, no, not everything is biochemistry, speaking from a perspective of chemistry.
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Attraction has to do with reproduction. If biology wouldn't do something to drive us to insert genitalia into someone else's, the idea is disgusting. Who would do that!!?! There has to be an intrinsic tendency, otherwise we wouldn't reproduce.
Oh wait, but that's love. Well, yeah. Wait, no. When I say love, I mean an entirely different experience. And I have been a witness to this experience. To love, is to be sensitive, towards beauty. Now the very statement conveys 'to be sensitive'. If you are sensitive, you find beauty in everything. This is the cause of acceptance. And neutrality.
Hey!! But THATS ALSO A BIOCHEMICAL REACTION!!
Yeah, but the perspective is different, because the seer is different. Intellect is the ability to discriminate consciously.
The way intellect works, is by breaking down into pieces. By shredding a flower into pieces, you can know about it structure. Dig deeper, you can know its molecular constituents. Even deeper, you reach atoms. Keep doing that, you'll see that there's no material. You came to know everything about the flower. But in that very process, the flower is gone. Its integrity is gone.
The idea is to witness its beauty.
You have known everything about it, but you haven't known the flower itself. I mean, if I want to know you, I can't just cut you into pieces to a subatomic level.
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Poets are true lovers. They see beauty in clouds. For an intellectual, cloud is just a mass of condensed watery vapor. But for a lover, it is something different. They see beauty in...... you get the idea.