Giving up anything and everything back to him, which includes your mind, experiences, body, expectations, whatever makes you you.
Completely giving up anything and everything, any single idea, expectations, experiences, insights, mind chattering etc…
When you do that, it is not gonna be proving anything, but clearly seeing that body is one with universe.
Therefore, separation is impossible, which is the reason of Love.
Love is the reflection of God, trough the body.