For both he that sanctifieth and they who are sanctified are all of one: for which cause he is not ashamed to call them brethren. Hebrews 2:11
Jesus teaches us to call His Father our Father. He is not ashamed to call us brethren (Hebrews 2:11). So ready, so eager, is the Saviour's heart to welcome us as members of the family of God, that in the very first words we are to use in approaching God He places the assurance of our divine relationship, "Our Father."
Here is the announcement of that wonderful truth, so full of encouragement and comfort, that God loves us as He loves His Son. This is what Jesus said in His last prayer for His disciples, Thou "hast loved them, as Thou hast loved Me" (John 17:23)....
How can we ever be in doubt and uncertainty, and feel that we are orphans? It was in behalf of those who had transgressed the law that Jesus took upon Him human nature; He became like unto us, that we might have everlasting peace and assurance. We have an Advocate in the heavens, and whoever accepts Him as a personal Saviour is not left an orphan to bear the burden of his own sins. (Thoughts from the Mount of Blessing, 104)
Reflection: Not one of us has to be left out. God's love knows no bounds. No matter what we have done, when we are truly sorry for that sin and turn away by His power, we become his sons and daughters--children of the heavenly King and a brother and sister to Jesus. Amazing Grace!