King James Bible
"The Spirit itself beareth witness with our spirit, that we are the children of God:"
The Holy Spirit provides internal testimony alongside the believer's own spirit, creating a dual witness to spiritual reality. This joint testimony reflects a profound communion where God's Spirit directly communicates with the human spirit, transcending mere intellectual knowledge. The content of this witness is our adoption into God's family—not servants or subjects, but children with full inheritance rights. Paul emphasizes this familial relationship throughout Romans 8, contrasting it with the slavery to fear mentioned in verse 15.