Considering the initial state of the pot, that it was dirt, dust; it was walked on having little value to anyone. The pot has worth due to the work of the Potter. The pot needs to see that the Potter has done a tremendous thing to make the pot something useful and not try and tell the potter he/she needs to do things differently.
Christians react the same way when we complain that we are not the way we wish we were; we should have been taller, thinner, prettier, or born into a different family; basically complaining about anything God has done or not done for us because we think we would be more effective. It is the same thing that Moses did when he saw the burning bush. He thought God picked the wrong type of guy for the job.
The better attitude and behavior is to realize where God brought us from and understand where He is bringing us to, is so much farther then where we truly deserve to be. We need to praise Him for working in our lives rather than complain that He