"The Spirit itself beareth witness with our spirit, that we are the children of God. And if children, then heirs; heirs of God, and joint-heirs with Christ; if so be that we suffer with him, that we may be also glorified together."
I am a child of God — this song is well known and well beloved by every 3 year old I teach in nursery class on Sunday. It is a crucial principle of the gospel that explains the "why" of so many doctrines the prophets have taught. God provided a Savior for us, and Christ accepted the call to be our Savior, because we are His children and He loves us. He pours blessings upon us because we are His children and He loves us. He gives us weakness and challenges because we are His children and He loves us. We are heirs of the kingdom of God. That means, if we suffer with Christ, or take upon ourselves His name and His commandments, we are eligible to receive "all the Father hath", just as Christ will. We are eligible to receive of His glory and of His power. Why? Because we are His children, and He loves us.