There are two kinds of believing: first, a believing about God which means that I believe that what is said of God is true. This faith is rather a form of knowledge than a faith.
There is, secondly, a believing in God which means that I put my trust in Him . . . and believe without any doubt that He will be and do to me according to the things said of Him. Such faith, which throws itself upon God, whether in life or in death, alone makes a Christian.
Martin Luther