If a person believes in his heart but does not have any outward gesture, the world will still consider him to be part of it. If a person merely says that he has believed in the Lord, others will not believe him. But the moment he is baptized, they will know that he is no longer one of them. Therefore, baptism is the best way to free oneself from the world. If you want to be freed from the world, you must be baptized. Baptism is an open testimony, and we should not be afraid to let others witness it.