Use keen discrimination. I do not ask you to give up such a critical faculty. The Jnani sees everything as the Divine Substance, the Devotee sees everything as His Reminder, His Play, the Karma-yogi sees everything as Service to the Lord. It is all a question of aptitude and taste, and the stage of reason and emotion. But darkness does not come back from wherever it went to as you entered with the light.
Darkness is there all the time.
Only your presence caused the light to prevail. Leave with your light, and darkness will again prevail in that room. So it is with the body, and life. And so it is also when the Grace of the Lord is won in full. Jnana will prevail, for the delusion of separateness is powerless in light.