How do you KNOW?

I know my religion is right because I feel the eternal Tao running through me, I sense it in all living things and feel a great connection with it. When reading the scripture of Lao Tzu I am filled with peace and understanding--and after reading the scripture I feel smarter and more capable--as if the inspiration has lasting effects. Most of all, I know because logic tells me it is true--I can read the work and know through reasoning that that's how things must really be.