'Fullness of God' in the Bible

and [that you may come] to know [practically, through personal experience] the love of Christ which far surpasses [mere] knowledge [without experience], that you may be filled up [throughout your being] to all the fullness of God [so that you may have the richest experience of God’s presence in your lives, completely filled and flooded with God Himself].

For all the fullness of God was pleased to dwell in him

For the entire fullness of God’s nature dwells bodily in Christ,