When I was in the corporate world, we had a saying that helped focus us on projects: "Keep the end in mind." As a consultant who managed a workgroup, I would frequently remind the team what it was that we promised to deliver to the client, and that would do more than anything else to get us to deliver what the client needed on time and within the agreed-upon budget.
If we apply that to the Mass, then we would keep the Dismissal in mind from the minute we left our homes until the presider says, "The Lord be with you" for the last time.
And what happens in the Dismissal? Very simply, after receiving God's blessing through the words of the priest, we are dismissed through the words of the deacon. It doesn't take very long, but it is crucially important. It is so important that the Mass is named for the dismissal rite. The words in Latin that the deacon uses to dismiss the assembly are, "Ite, missa est"; the word Mass is derived from the word missa.
And what does "Ite, missa est" mean? Probably the best translation is, "Go, you are sent." So, it is a missioning of sorts (notice that Latin word missa again!). We are sent out from our sacred assembly to carry on the mission of Jesus. That is what we should be keeping in mind beginning with our gathering, through the Penitential Rite, the Gloria, the Opening Prayer, the Liturgy of the Word, the Liturgy of the Eucharist, and, yes, even the announcements. We have gathered so that we can receive what we need in order to be sent out again.
The dismissal words in the current translation of the Roman Missal (again, see the missa?) probably don't do justice to what we are really trying to do in the Dismissal at Mass. "The Mass is ended, go in peace" really doesn't convey that sense of being sent on mission very effectively. "Go in peace to love and serve the Lord" is a little better, but only if our eyes are open to the fact that the Lord Jesus can be seen in the people around us (especially those most in need of our attention), and that the Lord God can be seen in the wonders of creation, of which we are the stewards.
In recent years, Pope Benedict XVI has commented publicly in the need for Catholics to understand more fully what the Dismissal is all about. In order to help with that, he believes new words are necessary to make the purpose of the Dismissal clearer. So, he has instructed the Roman congregation that is responsible for liturgical rites to add two new options for the deacon to use in the Dismissal. They are:
Go and announce the Gospel of the Lord.
and
Go in peace, glorifying the Lord by your life.*
When the new Order of Mass is implemented in the US, these two options will appear in the official texts, to which we say, "Thanks be to God!"
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*Readers who have attended a Spanish Mass in the US may have heard the Spanish equivalent of this, as it has appeared for years as an option in the official Mass text for Mexico.