Faith

What is faith? The bible describes it as:

Faith is the now the substance of things hoped for and the evidence of things not seen (Hebrews 11:1 KJV)

I will actually accept that definition with no problem. It says exactly what I believe faith to be, what it has been in my own life: Believing passionately things for which there is no physical evidence, and which may actually violate the laws of the physical universe. These things we believe are not provably untrue, mind you. They are simply profoundly unlikely.

Now, how is it that really, really, really believing stuff which is really, really, really¬†improbable makes you a better person? I just don’t get it. Does it, like, spruce up the old brain cells somehow?

Please help me out here.