Rev 3:20
20 "Behold, I stand at the door and knock; if anyone hears My voice and opens the door, I will come in to him and will dine with him, and he with Me.
NASU

Never waste time when He knocks at your door, He doesn't waste time either. When He comes in a lot of things and people that are temporal  will walk out on you and you will have everything that is eternal. He makes you selfless but full of Him, you will always be in the light for He Himself is light.

WHAT A WONDERFUL THING TO LET HIM IN.