The communion of saints, when referred to persons, is the spiritual union of the members of the Christian Church, living and the dead, but excluding the damned. They are all part of a single "mystical
Revelation 5:8 presents the saints in Heaven as linked by prayer with their fellow Christians on earth
Purgatory is a belief in Catholic theology. It is a passing intermediate state after physical death for purifying or purging a soul before entering Heaven. A common analogy is dross being removed from
Communion of saints
…Ecclesia militans) consisting of those alive on earth; the Church Penitent (Latin: Ecclesia poenitens) consisting of those undergoing purification in purgatory in preparation for Heaven; and the Church Triumphant (Latin: Ecclesia triumphans) consisting of those already in Heaven. The damned are not a part of…
Image of a fiery purgatory by Ludovico Carracci. Top: Christ directing, with Mary and interceding saints. Middle: Angel showing a soul the intercessors. Bottom: souls being purged with various attitudes.
Image of a non-fiery purgatory (Gustave Doré: illustration for Dante's Purgatorio, Canto 24 in Divine Comedy). Right: Dante and companions observe. Middle: willing souls gather round a sweet-smelling tree with fruit they cannot eat, to be purged of residual gluttony.
Dante gazes at Purgatory (shown as a mountain) in this 16th-century painting.
Purgatory, by Peter Paul Rubens. Top: Trinity, with Mary; Middle: Angels; Lower: purified souls being pulled up towards heaven; Bottom: souls in non-fiery purgation