The object of Christian belief is God, so we must first start with knowing God. The key to knowing God is faith. The biblical definition of faith is: "Faith is the substance of things hoped for, the evidence of things not seen" (Hebrews 11:1). That is to say, things in the future, although they cannot be seen with their own eyes, can be believed sincerely. Believing is not a blind superstition, but requires an open heart, careful verification, plus personal experience, and a firm belief in the results obtained.