Knock knock

Have you ever thought about life without a method to knock on doors? If knuckles weren't so painless and universal and effective, how would we know when our dear friends are at our doorstep or we on theirs? Here's to knocking on doors. So convenient.

Unless the Lord builds the house, those who build it labor in vain.  Unless the Lord watches over the city, the watchman stays awake in vain. Psalm 127:1