The communion of saints is the spiritual solidarity which binds together the faithful on earth, the souls in purgatory, and the saints in heaven in the organic unity of the same mystical body under Christ its head, and in a constant interchange of supernatural offices. The participants in that solidarity are called saints by reason of their destination and of their partaking of the fruits of the Redemption (1 Corinthians 1:2 — Greek Text). The damned are thus excluded from the communion of saints. The living, even if they do not belong to the body of the true Church, share in it according to the measure of their union with Christ and with the soul of the Church. St. Thomas teaches (III:8:4) that the angels, though not redeemed, enter the communion of saints because they come under Christ's power and receive of His gratia capitis.
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