"But in your hearts revere Christ as Lord" (1 Peter 3:15).
There are many who call Jesus Lord with their mouths in a certain setting, but do not present evidence of it being true with the conversations, tones, attitudes, motivations, actions, or thoughts. Peter brings home the fact that we are going to face both trying periods and trying people, and through it all, we must continue to revere Him in our hearts.
At very core of who we are, we should live pure, holy, reflection of who He is. THIS, in return, should be the life-source by which all manifestations of our lives are produced.
Even now, in our own moments of frustration and disagreement, we must purpose to honor God, and seek to be holy before Him in our hearts. Out of our hearts, pure or otherwise, will produce the fruits by which we will be identified. No matter the emotions that may exist on any particular day, the choice to be made is whether or not we will choose to honor God in our hearts. This will be the deciding factor in producing that fruit that will serve as evidence of that choice.
Is He Lord in your life? Is He your authority? Are you living in obedience to Him? In every way? If the answer is "yes," then the fruits that are being produced in your life will show evidence that He is, in fact, Lord. If the answer is, "Maybe some areas of my life, but not all," then He is not Lord. But don't lose heart. Surrender and repentance are the access codes that enable Him to be what He's always desired to be in your life. Lord