What is the relationship between the eucharist and our awaiting the second coming of Christ the Lord?

The Didache contains a text about the eucharist, which includes a prayer for the Church to gather together from all the ends of the earth in the prepared kingdom of God,¹⁵⁷⁰ as well as another prayer that fervently asks the Lord Jesus to come:¹⁵⁷¹

“‘Be mindful of thy Church, O Lord; deliver it from all evil, perfect it in thy love, sanctify it, and gather it from the four winds into the kingdom which you have prepared for it.’

‘Thine is the power and the glory for ever and ever.’

‘Let Grace come, and this present world pass away.’

‘Hosanna to the God of David.’

1568 See Mar Philoxenias (Arabic), (St. Mary’s Monastery, Dair Al-Surian, 2003).

1569 Philoxenus of Mabbug, “On the indwelling of the Holy Spirit” in Sebastian Brock and M. A. Mathai Remban eds. Philoxenus of Mabbug (Kottayam, India: St. Ephrem Ecumenical Research Institute (SEERI), undated): p. 46.

1570 “The Didache” in Early Christian Writings , trans., Maxwell Staniforth and Andrew Louth (Penguin, 1987) 9.4; 10.5.

1571 “The Didache” in Early Christian Writings , trans., Maxwell Staniforth and Andrew Louth (Penguin, 1987) 10.6.

‘Whosoever is holy, let him approach.’”¹⁵⁷²

“Be watchful over your life; never let your lamps go out or your loins be ungirt, but keep yourselves always in readiness, for you can never be sure of the hour when our Lord may be coming. Come often together for spiritual improvement; because all the past years of your faith will be no good to you at the end, unless you have made yourselves perfect … And then the signs of the truth will appear: first the sign of the opening heavens, next the sign of the trumpet’s voice, and thirdly the rising of the dead — not of all the dead, but, as it says, the Lord will come, and with him all his holy ones. And then the whole world will see the Lord as He comes riding on the clouds of heaven ...”¹⁵⁷³