Never seen

As gentle as the air,
blowing by..
never do you see or hear it,
when it passes by..
if you happen to hear
it lovely song,
you will fall in love..
and if you may
catch its beauty
you may never
seek it again..
it will be yours
if you may catch it,
but i must warn you
be good to it or
it may never be yours..
and if you hurt it
never again will it be.