The rose petals

“Sunlight is love”, said a rose petal
I cannot hold it, but I can feel it!”
“Oxygen is like love”, said another
Everywhere and nowhere
All at once.”
“What about water?”, said a third
It shows no sign its division!”
“Or gravity”, struck up a fourth
Always moving something somewhere”
“Who am I?”, demanded one
“Am I really worth something?”
“What?”, said the others
“You ask us to prove it!
Worth is hardly a truth
Nor a falsehood
But the act of giving
To someone who needs it more.”