Romans 10:17 says, "Faith comes by hearing and hearing by the word of Christ." If faith comes by hearing, how does it then grow?
In Matthew 17:20 Jesus metaphorically likened existing faith to a seed. A seed finds itself most productive when it is given the proper environment in which to germinate. Only then can it become something which repeatedly provides for its planter and others.
1Peter 1:5-8 says that the qualities of moral excellence, knowledge, self control, perseverance, godliness, brotherly kindness and love form the requisite environment which allows faith to sprout, until it becomes both useful and fruitful.
So, begin to concentrate on the cultivation of your faith and watch it grow into something which will not only change your world, but all those whom you influence. Live right, live well...