Adoption. The chance to become a son. Through the sacrifice of Christ, we have that. Read Galatians 4:1-5.
Now I say, as long as the heir is a child, he does not differ at all from a slave although he is owner of everything, but he is under guardians and managers until the date set by the father. So also we, while we were children, were held in bondage under the elemental things of the world. But when the fullness of the time came, God sent forth His Son, born of a woman, born under the Law, so that He might redeem those who were under the Law, that we might receive the adoption as sons.
Galatians 4:1-5 NASB
God brought everything together at the right time. He made a way for those who were trying to follow the law to have the ability to be made completely right with God. Are we willing to allow Christ to redeem us in order to be made sons and daughters?