If you have faith in the strength of your legs you are not afraid to go out into the world. You know that they will hold you up, even if the winds get very strong. When you have faith that your legs are strong, you welcome challenges and tests of their strength, becuase they help you learn where they are weak and how to make them stronger.
If you build a brick wall around yourself you don't get knocked over by the wind because you never go out into it. Some people are told that this is faith. They are told they should NOT test the strength of their legs because the wind will knock them over. If the person was to test their legs they would either be knocked over or not. If they were able to remain upright, they would know their legs were indeed strong. If they were knocked over, they would learn that their legs are not strong, which is good, because they would know they need to change things so they can stand up outside.
Challenges and questions are not our enemy, they are our friend. They help us get information about the things we believe and the choices we make. Change is scary, so it makes sense why we shield ourselves from questions and challenges- because we might learn that something should be changed. But if you really think something is true, take a chance, welcome questions- test your faith.