“You are the salt of the earth, but if salt has lost its taste, how shall its saltiness be restored? It is no longer good for anything except to be thrown out and trampled under people’s feet. …”

Matthew 5:13-16

Salt without saltiness is not salt.
Christian without Christ-likeness is not Christian.

Window is the light of the room, not because it has light by itself, but that the light shines through the window.