Now if we are children, then we are heirs—heirs of God and co-heirs with Christ, if indeed we share in his sufferings in order that we may also share in his glory. Romans 8:17 (NIV)
As children of God through faith in Christ Jesus we jointly share with Christ all that he is and has. First off we share in his sonship. Put another way we share a Father, we have the same Father. The Father of Jesus is my Father. Jesus himself said His Father is our Father. John 20:17. That the Father loves us with the very same exact love He loves Jesus, the very same exact way. John 17:23. So we jointly share Abba Father’s love with Jesus. We are joined heirs with Jesus Christ. The Word declares God is faithful by whom we were called into the fellowship of his Son Jesus Christ our Lord. 1Corinthians 1:9. God has called us into fellowship with his Son. Fellowship means sharing equally together all things. We share equally all things together with Christ. Fellowship means having all things in common. We have all things in common with Christ.
We share equally in his life, revealed in Scripture as eternal life, the God kind of life. We share his righteousness. He is our righteousness. We share in his wisdom. He is our wisdom. We share in his strength. He is our strength. We share in his Spirit. Father God sent the Spirit of His Son into our hearts crying Abba Father. Galatians 4:6,7