“I thank my God always when I remember you in my prayers because I hear of your love and the faith which you have toward the Lord Jesus and all the saints, and I pray that the sharing of your faith may promote the knowledge of all the good that is ours in Christ. For I have derived much joy and comfort from your love, my brother because the hearts of the saints have been refreshed through you.”
Philemon 1:4-7
In St Paul’s letter to Philemon, he rejoices in the community of faith-sharing among the early Church much as the Lord is pleased with us today when we do the same. By sharing the same faith, Christians have entered into communion with Christ and one another. Christians should not only love and believe in Christ: through Him and in Him, they should love and have faith in their fellow Christians.
Grounded in the Sacraments, and particularly the Eucharist, those who have accepted Christ and been raised with him through Baptism should persevere in the faith they have received. (Colossians 2:6-23)
Catechism
806
In the unity of this Body, there is a diversity of members and functions. All members are linked to one another, especially to those who are suffering, to the poor and persecuted.
810
“Hence the universal Church is seen to be ‘a people brought into unity from the unity of the Father, the Son, and the Holy Spirit'” (LG 4 citing St. Cyprian, De Dom. orat23: PL 4, 553).
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The term “communion of saints” refers also to the communion of “holy persons” (sancti) in Christ who “died for all,” so that what each one does or suffers in and for Christ bears fruit for all.
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Finally, by the Eucharistic celebration we already unite ourselves with the heavenly liturgy and anticipate eternal life, when God will be all in all.