I think the latter develops into the former somehow. I don't think there's a thing called love at first sight, I think it should be renamed lust at first sight. If you ask those who fell in love "at first sight", they're more likely to remember "the eyes, the smile, the hair, the whatever" that's tangible...That's the base of true love actually, which is the passion aspect...You can ony truly love someone when you've spend a long time with them, sharing all the positive and negative - then they become your soulmate...and I believe that there'll also be telepathic matters then as well. It just develops over time. Just a bit further from the point, while your definition of love may change, a successful marriage consists of passion, love (respect, care etc) and over time, he or she may also become part of you, like you're from one family, bonded by blood. It's a triangle where no aspect can be missing - Passion and love at the base and the "family-like" tie at the top as it id developed later. So in all, I do believe in soulmates and the fact that you can only grow to truly love someone...but I don't believe in eternal passion unless both parties work hard at keeping the initial passion.