The Orthodox understanding of the Second Coming of Christ is clear: the Lord Jesus Christ truly will return. His second advent is not a myth, nor an empty promise, nor is it a metaphor. In fact, each time the Divine Liturgy is celebrated, the priest makes a proclamation to the Father which reveals how the Church responds not only to the Second Coming of Christ, but to all of His work.
"Remembering this saving commandment [Jesus' command to eat His flesh and drink His blood] and all that has been done for us -- the Cross, the Tomb, the Resurrection on the third day, the Ascension into Heaven, the sitting at the right hand and the Second and glorious Coming -- we offer You Your own, from what is Your own, on behalf of all and for all."