You might be able to constrew the phrase to work, depending on how you define love. If you think of love as being some definite state of being, then it probably fails, as described above. However, if you think of love as being an experience, then the phrase has some merit (I think). This saying usually comes about during times of reflection. For example, happily married couples, with children, grandchildren, etc., usually can recall the instant they saw eachother. At that point, they may, or may not, have been in a state of lust, yet they recognize it as the beginning of their life, or their love. I also believe, being a man, that many men follow a process of setting a dream, and then, fulfilling that dream. If this is true of women as well, then love at first sight may refer to the circumstance whereby a man and woman simulataneously set eachother as their dreams(lifelong) upon seeing eachother. In any case I was finally there, to sit on my throne, as the prince of her heart.