One doctrine that only a true believer can understand is about surrender. Surrender is such a powerful, wonderful, awesome experience! It is so awesome only a person who has experienced it can relate to another person sharing it. Surrender is saying, I am yours LORD. And yet it is more than that. It is saying, I am willing to follow, I give my all. And yet it is more than that. It is so awesome, so wonderful, so powerful, when a man's spirit communes with God's Spirit and confesses: "I am yours LORD, I am willing to follow, I give my all." Those are fairly simple words, but if it comes from within deep a man's heart, it brings such tremendous freedom that the inner man experience, and he is translated up into the next level of his relationship with the LORD; our King, our Father, our God. And it brings forth a new revelation that because he gives his all, he gains all in Christ!
Jesus is the way, the truth and the life. First you will find the way, then the truth, then you will find life. Life is the ultimate destination.