They are both fire
He was a flame stuck to a candle wick and she was a forest on fire 
Licking the lips of the sky trying to burn heaven.
But he knows that Gods always used burning bushes to show himself.
So when he says that you are proof that God exists, he means that your lips have always been too nectar and the butterflies in his belly are just junkies trying to get a sugar high.
When he says that you are proof that God exists, he means that your lungs make air both breeze and wind so kiss with caution.
Your skin has always seemed like the place where sunsets come to practice eternity.
But they are both fire
Both flame
Too hot to touch 
Both fire
Both flame
Daring God for rain