It is ridiculous for the pot to second-guess the Potter, because the pot has no control over how it was made. The pot cannot go back and remake itself. It does not have the capabilities or knowledge like the Potter.
Christians second guess God during trials, times of doubt, when we feel inadequate, lose confidence, or feel like God has abandoned us.
A better attitude and behavior Christians (the pot), should have before the Creator (Potter), is one of hope, faith, trust in His power and might that God, as Creator knows what is best for us. He is in control, and is working out His plan and purpose in each of our lives.