When Justin Taylor spoke at our church, he encouraged us to pick up J.I. Packer's book, Knowing God, and read the 19th chapter on our adoption as sons. If you have the book, I encourage you to do so. For me, this section was especially challenging:
Do I, as a Christian, understand myself? Do I know my real identity? My own real destiny? I am a child of God. God is my Father; heaven is my home; every day is one day nearer. My Savior is my brother; every Christian is my brother too. Say it over and over to yourself first thing in the morning, last thing at night, as you wait for the bus, any time when your mind is free, and ask that you may be enabled to live as one who knows it is all utterly and completely true. For this is the Christian's secret of --a happy life? -- yes, certainly, but we have something both higher and profounder to say. This is the Christian's secret to the Christian life, and of a God-honoring life, and these are the aspects of the situation that really matter. May this secret become fully yours, and fully mine.