How do we know the doctrine of Christ's fullness is true?

The truth of Christ's fullness is founded on specific biblical declarations. Colossians 2:9 states that all the fullness of the Godhead dwells bodily in Christ, making it evident that He is fully God and fully man. The phrase 'all fullness' underscores the completeness of His divine nature and His sufficiency for salvation. Furthermore, the context of these passages highlights God's sovereign purpose in placing all spiritual blessings in Christ, which reinforces the validity of this doctrine.