36. Following Dies Domini, I therefore wish to insist that sharing in the Eucharist should really be the heart of Sunday for every baptized person. It is a fundamental duty, to be fulfilled not just in order to observe a precept but as something felt as essential to a truly informed and consistent Christian life. We are entering a millennium which already shows signs of being marked by a profound interweaving of cultures and religions, even in countries which have been Christian for many centuries. In many regions Christians are, or are becoming, a "little flock" (Lk 12:32). This presents them with the challenge, often in isolated and difficult situations, to bear stronger witness to the distinguishing elements of their own identity. The duty to take part in the Eucharist every Sunday is one of these. The Sunday Eucharist which every week gathers Christians together as God's family round the table of the Word and the Bread of Life, is also the most natural antidote to dispersion. It is the privileged place where communion is ceaselessly proclaimed and nurtured. Precisely through sharing in the Eucharist, the Lord's Day also becomes the Day of the Church, ²² when she can effectively exercise her role as the sacrament of unity.