The Apostle and Evangelist John, author of the Fourth Gospel, three Epistles, and Revelation. Known as "the Theologian" for his profound spiritual insights and "the Beloved Disciple" for his closeness to Christ. Celebrated on May 8th, his feast honors his unique witness to Christ's divine nature and his care for the Theotokos.

The central worship service of the Orthodox Church, celebrating the Eucharist (Holy Communion). Usually celebrated on Sundays and feast days, the Divine Liturgy consists of the Liturgy of the Word (scripture readings) and Liturgy of the Faithful (Eucharistic prayer and communion). The most common forms are the Liturgies of St. John Chrysostom and St. Basil the Great.

The sacrament of ordination to the threefold ministry of bishop, priest, or deacon. Ordinations take place during the Divine Liturgy, with deacons ordained after the consecration of the gifts, priests after the Great Entrance, and bishops after the Little Entrance. The bishop lays hands on the ordinand while the people sing "Axios!" ("He is worthy!"). Through ordination, the Holy Spirit grants the grace needed for ministry. Only men may be ordained, and bishops must be celibate monastics, while priests and deacons may be married before ordination.