JI Packer has a good book titled "Knowing God." I highly recommend it. Some thoughts I had from a chapter titled Sons of God.
God the Father. He is Father to those who are his chosen ones. (Galatians 3:26- "You are all sons of God through faith in Christ Jesus.") He ADOPTED us as his children, his grace poured out unto us. To understand who we as Christians, we need to know God as our Father, and realize how we are his children. As his children, we should have complete and total faith that we can rely completely on him, come before him (humbly) but at the same time confidently because we know as his children we can always trust him. He loves us, he is ALWAYS with us, and he is our king (authority).
To better understand adoption: (Westminster Confession) "All those that are justified, God grants, in and for his only Son Jesus to make partaker of the grace of adoption: by which they are taken into the number, and enjoy the liberties and privileges of the children of God; have His name put upon them, receive the Spirit of adoption; have access to the throne of grace with boldness; are enabled to cry abba Father; pitied, protected, provided for, and chastened by Him, as by a father; yet never cast off, but sealed to the day of redemption, and inherit the promises, as heirs of everlasting salvation."
And here is something crazy,being adopted by Christ is an even better thing than being justified. I mean really, how incredible is it that God has chosen his children (what a endowment!) and has forgiven us is (amazing in itself), but he has furthermore, given us a RELATIONSHIP with him, an intimate, unbelievable, revealing himself to us, relationship. Praise be to him!