Place God First, God's Will is for us to have a right relationship with Him. We are to recognize His sovereignty over the universe, and our lives.
Our identification as a "corporate" church is not a building; rather, it is a relationship of community, where we are His priests!
Peter takes the argument of what our Lord has done for us to show how we are to be as a corporate collaboration of people in Him.
Do not grumble, as in do not be complaining. Don't criticize, find fault, be irritable or argumentative, or whine to fellow believers-and definitely not to unbelievers.