There are people whom I have lived with or known for all my life or all their lives, but I know that we'll never know each other 100%. With God, it's different. He already knows me thoroughly, for he is all-knowing and my creator! How do I know him? He is much easier to know than any other human creature because he is honest, trustworthy, straight forward, and completely open to us. Jesus has come and shown us what the Father is like! Once you know God, you know him all at the most personal level.