...the day of the eucharistic Mystery par excellence is the day of the Lord’s Resurrection, the Lord’s day: Sunday symbolizes time transcended, because it is at once the first day of creation and the eighth day of the kingdom. It is the ‘day without evening, perpetual and unending. It is not that it does not yet exist, but that it is going to exist. No: it existed before the ages, it exists now, and it will exist to the endless ages.’

“The Divine Liturgy – A Commentary in the Light of the Fathers” by Hieromonk Gregorios
Quotations from St. John Chrysostom, St. Basil the Great, St. Simeon the New Theologian