The "fullness of Christ" is a concept that can be interpreted in several aspects...
The "fullness of Christ" is a concept that can be interpreted in several aspects.
1) The fullness of the presence of our Lord Jesus Christ. This is, in fact, the reason why Christians gather in the Church, as the Lord Himself said about it: "For where two or three are gathered together in My name, I am there in the midst of them" (Matthew 18:20). Furthermore, the Lord says about this: "If anyone loves Me, he will keep My word; and My Father will love him, and We will come to him and make Our home with him" (John 14:24). The Greek word can be translated as a) dwelling, b) rest, c) abiding. It is speaking of the presence of God in a person's life.
2) The Apostle Paul in the Epistle to the Ephesians says: "till we all come to the unity of the faith and of the knowledge of the Son of God, to a perfect man, to the measure of the stature of the fullness of Christ" (Ephesians 4:13). The last words can also be translated as "to the measure of the age of the fullness of Christ." The Apostle is saying that the life of a Christian is directed towards being able, following the apostle himself, to say: "it is no longer I who live, but Christ lives in me" (Galatians 2:20). The apostle also says about this: "Imitate me, just as I also imitate Christ" (1 Corinthians 11:1).
The fullness of Christ, undoubtedly, cannot be adequately described in words; however, these two aspects allow us to identify the main point.
As for the question of how to enter into this fullness, the answer follows from what has been said above. The "gates" through which we can enter the fullness of Christ is the Church. In it, the possibility of prayerful communion with Christ and participation in the sacraments of the Church is revealed to us, where He Himself comes into our lives according to His promise. Also, a fundamental condition for entering into the fullness of Christ is living according to His commandments. But most importantly: since it would be naive to try to force Him into the fullness of communion with us, we must first of all ask this of Him Himself. Many Christians resort, in addition to this, to the prayers of other members of the Church, first and foremost the Most Pure Mother of God.