When one drop of rain hits my windshield, I am not motivated to do anything. However, when a number of rain drops band together and descend on my windshield, I am motivated to action least I am blinded by them.

Matthew 18:18-20 (NIV)
18 "I tell you the truth, whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven.
19 "Again, I tell you that if two of you on earth agree about anything you ask for, it will be done for you by my Father in heaven.
20 For where two or three come together in my name, there am I with them."