It is very important to participate in the Sunday Eucharist as it is a time you become more like God and become more like Jesus by uniting yourself with Him in receiving the Most Holy Body and Blood of Christ worthily. By receiving His Most Precious and Holy Body and Blood worthily in the Eucharist we obey Jesus' command and take up our Cross daily and follow Him.
Nobody can worthily celebrate the Eucharist without first receiving Baptism and Penance. In the Latin Rite, it is also necessary to receive Confirmation when one is old enough.
Reconciliation and Eucharist should both be received frequently, but Holy Communion, in the Eucharist, should only be received worthily (as in, you've been to Confession and prepared to receive Our Blessed Savior). To just receive Holy Communion, if you are not in a state of grace and not prepared is worse than useless, it is down right harmful and St. Paul warns us of this.
Eucharist (Communion) is one of the four sacraments of initiation along with Baptism, Reconciliation and Confirmation; it is called a Sacrament of the living as you must be in a state of grace to worthily receive it. Sacraments such as Baptism and Penance are "Sacraments of the dead" because you are dead in your sins when you receive them, and they restore you to a state of life.
In the church.
in a convoluted sense yes you do, its not the normal Eucharist though.
Eucharist is a form of Initiation to the church to receive God's Communion.
You must receive the Eucharist properly because it is a solemn and ancient religious ritual, and if you do not do it properly you would be showing disrespect to that tradition.
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Catholics must receive the Eucharist at least once per year during the Easter season.
Roman Catholic AnswerThe sacraments are the normal way in which God gives sanctifying grace to His people. You can not receive any of the sacraments without Baptism. In the normal course of life, you can not receive salvation and enter heaven without baptism, penance, and Holy Communion as you go through your life. You don't exactly utilize them, you receive them as gracious gifts from the Almighty - if you receive them worthily. For instance St. Paul points out that receiving the Most Holy Eucharist unworthily is eating your own condemnation. To put it in one sentence, the effects of worthily receiving the sacraments is eternal life in heaven with God, the effect of not receiving the sacraments (or receiving them in an unworthy manner) is eternal torment in hell.
Eucharist