The Eucharist is the “source and summit of the Christian life”. All of the sacraments point to the celebration of the Lord’s Passion and Resurrection in the sacrifice of the Mass. The entire life of the Church leads to the Eucharist, where Christ is present in a unique and incomparable way. Jesus Christ is present in a real, true and substantial way in the Most Blessed Sacrament of the Eucharist. It is his body, blood, soul and divinity as true God and true man which are present in a sacramental manner. Each Mass makes the one sacrifice of Christ on the cross present, actual and effective for the sake of God’s Church and the whole world. His sacrifice becomes our sacrifice as our lives become united with his through the celebration of the Eucharist. Holy Communion increases our union with Christ and with his Church. It preserves and renews the life of grace received at Baptism and Confirmation and makes us grow in love for our neighbor. It strengthens us in charity, wipes away venial sins and preserves us from mortal sin in the future. We are united with the Church of all ages through the Eucharist and receive the promise of eternal life with God through Jesus Christ and in the Holy Spirit. (Compendium of the Catechism, nos. 271 – 294)
First Communion is celebrated, generally, in second grade.