Faith, it is not visible except in the works that are created by it. Is it possible to love without expressing that love in some tangible manner; a hug, a kiss, a marriage? No, love drives us to show it to one another, and faith is the same. When we have faith in Jesus, and God, we have no option but to show it to them in some manner. What is very interesting is that doing works of faith usually involves loving or doing something good, or merciful, for another person. We express our love for God by allowing Him to see our hearts, but we show our faith in Him by our obedience to his will... by our works.