In His Word God has, for our salvation, given a clear and completely sufficient knowledge of Himself. From this Word people have a supernatural knowledge of God. Only through this Word does God reveal to us His grace in Christ and free us from an accusing conscience. Thus we learn to know God in the right way, and learn to know and believe that we are saved through faith in Christ.
Note: The Bible does not answer all our questions, but it contains everything that we need to know in order to be saved.
1 Pet. 1:23: Being born again, not of corruptible seed, but of incorruptible, by the Word of God, Which liveth and abideth forever.
Joh. 17:3: This is life eternal, that they might know Thee the only true God, and Jesus Christ, Whom thou hast sent.