When Christ makes His home in our hearts, and when we are full of strength to apprehend with all the saints the dimensions of Christ and to know by experience His knowledge-surpassing love, we will be filled unto all the fullness of God, which is the church, the corporate expression of God for the fulfillment of His intention.
The fullness of God implies that the riches of all that God is have become His expression. When the riches of God are in God Himself, they are His riches. But when the riches of God are expressed, they become His fullness (John 1:16). All the fullness of God dwells in Christ (Col. 1:19; 2:9). Through His indwelling, Christ imparts the fullness of God into our being that we may be filled even unto the fullness of God to be the practical manifestation of the church, in which God may be glorified in His expression (v. 21).