to an incorruptible and undefiled inheritance that doesn't fade away, reserved in heaven for you,
Paul ties together the ideas of children and heirs in Romans 8:16-17 : "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." Paul makes it clear: if we are His children, then we are also His "heirs."