We cannot speak of Ordinary Time without speaking of Sunday. The every seven day celebration of the Lord’s Day is the basic structure upon which the Church Year is built. The great liturgical celebrations of Advent-Christmas and Lent and Easter are more expansive celebrations of particular aspects of the paschal mystery which we celebrate every Lord’s Day. These special seasons focus our attention upon critical dimensions of the one mystery, a mystery so overwhelming that we are compelled to separate out its various elements for particular attention.
Ordinary time is not very ordinary at all. Ordinary Time. The celebration of Sunday is the identifying mark of the Christian community which comes together, remembering that on the first day of the week the Lord of life was raised up and creation came at last to completion. Sunday. How we live Sunday proclaims to the world what we believe about redeemed time now and forever.
What happens in our churches is the fruit of our week. What happens as the fruit of the week is the beginning of the week to come. Sunday, like all sacraments, is a point of arrival and departure for Christians on their way to the fullness of the kingdom. This is not ordinary at all. This is the fabric of Christian Life.
Taken from the Saint Andrew Bible Missal