No it is not a knock, knock joke. Someone knocks at our door and we run to answer it.
Yet opportunities, love, fun, stillness, ideas, soul, God, etc are knocking all the time and we are unconscious of it. So even the conceptual knocking is a trigger for our response. If we miss the initial knocks at the door and wait too long conflicts, sickness, depression, anger, fears sneak in the back door.
The door is our awareness door. Listen a few times per day. See who is there. Most often it is what we need more often than what we want. Increase your awareness. Catch the early warning signals before it’s too late. Experience our daily awareness exercises.