Romans 12:3 For I say, through the grace given unto me, to every man that is among you, not to think of himself more highly than he ought to think; but to think soberly, according as God hath dealt to every man the measure of faith.
So what are we doing with our faith? To build faith is like our bodies, we have to eat right and exercise. We eat right by what we listen to, and what we read, or watch. We exercise by doing something.
It's not hard to eat the good stuff, but it's real hard not to eat the bad stuff. It is easy to eat the salad for lunch, if we can add the dessert after it. It is a bit harder to feed the spirit, if we eat any bad, it ruins the good. So we have to be careful what we see, and hear.
With exercise very few people do it, because it is fun.
Most often we do it, because we want to feel better. So it is with our faith. We have to decide to do it! When we face a fear, we grab faith by the hand, and walk on. It will get easier each time.
Like it is with our bodies, it is hard to eat right and exercise, in our spirit.