Such a friendship has no model but itself, and can only be compared to itself. It was not one special consideration, nor two, nor three, nor four, nor a thousand; it was some mysterious quintessence of all this mixture which possessed itself of my will, and led it to plunge and lose itself in his, which possessed itself of his whole will, and led it, with a similar hunger and a like impulse, to plunge and lose itself in mine. I may truly say lose, for it left us with nothing that was our own, nothing that was either his or mine.
~ Montaigne
from Essays of Michel de Montaigne
In any true love - a mother's for her child, a husband's for his wife, a friend's for a friend - there is an excess energy that always wants to be in motion. Moreover, it seems to move not simply from one person to another but through them toward something else. ("All I know now / is the more he loved me the more I loved the world" - Spencer Reece.) That is why we can be so baffled and overwhelmed by such love (and I don't mean merely when we fall in love; in fact, I'm talking more of other, more durable relationships): it wants to be more than it is; it cries out inside of us to make it more than it is.
~ Christian Wiman
from My Bright Abyss: Meditation of a Modern Believer