How do I know
I’m the light?
Through the reflection
Of the light that
Illuminates your eyes
When you look at me.

How do you know
You’re the light?
Through the reflection
Of the light that
Illuminates my eyes
When I look at you.

Now we both know
We’re the light.

We both know
That we are one.

If you seek a simple proof;

“Let it be the light!”