For most people before becoming followers of God they are easy to describe by their mannerisms, how they talk, behave, if they drink, smoke, and many many other attributes that are easy to describe them by.
But when suddenly they notice that person is no longer being like or having those same traits but are basically the complete opposite then that becomes the Greatest Proof of Faith.
God might not have even given blessings that can be outwardly seen yet but a person becoming as opposite as the day is from the night flat out shows their beliefs have changed. And generally speaking that typically shows Faith in God.
But when suddenly they notice that person is no longer being like or having those same traits but are basically the complete opposite then that becomes the Greatest Proof of Faith.
God might not have even given blessings that can be outwardly seen yet but a person becoming as opposite as the day is from the night flat out shows their beliefs have changed. And generally speaking that typically shows Faith in God.