Be like that bird
Who, pausing in flight,
Feels the bough give way
Beneath her feet
And yet sings
Knowing she hath wings.
~ Victor Hugo
There is the same difference in a person before and after he or she is in love as there is in an unlighted lamp and one that is burning. The lamp was there and it was a good lamp, but now it is shedding light too and that is its real function.