Your convictions are only strong if they hold up under pressure. They must be tested in order to be proven. Your beliefs are only beliefs if they actually form the basis for your decisions and behaviors.
It has long been said that people don't always do what they say, but they will always do what they believe. So ... reversing that is a good way to see what you believe --- just watch what you say and do. Your decisions and behaviors will always expose your true convictions and beliefs.