passionate love is hormonal. castrate yourself and you will see what i mean. children who have not developed hormonally do not have passionate love right? the old people who lose their sexual desire also do not have passionate love (i've heard some still retain sexual desire). and just think about when passionate feelings start... when you become a teenager and the hormones start to flow. all this points to hormone levels being the cause of passionate love. this means that there is nothing magical about that spark you got when you saw that wonderful person across the room or you realized that your long time friend has the potential to be more. that spark was millions of years of evolution at work. more proximately, it was your hormones at work. do not forget your animal heritage.