The unique and indivisible existence of the Lord glorious in heaven, is not multiplied, but is rendered present by the sacrament in the many places on earth where Mass is celebrated. And this existence remains present, after the sacrifice, in the Blessed Sacrament, which is, in the tabernacle, the living heart of each of our churches.
Pope Paul VIYou also realize, Venerable Brothers, that the Eucharist is reserved in churches or oratories to serve as the spiritual center of a religious community or a parish community, indeed of the whole Church and the whole of mankind, since it contains, beneath the veil of the species, Christ the invisible Head of the Church, the Redeemer of the world, the center of all hearts, 'by whom all things are and by whom we exist'.
Pope Paul VIThe command to the Twelve to go out and proclaim the Good News is also valid for all Christians, though in a different way.... the Good News of the kingdom which is coming and which has begun is meant for all people of all times. Those who have received the Good News and who have been gathered by it into the community of salvation can and must communicate and spread it.
Pope Paul VI