The Eucharist is “the source and summit of the Christian life.” (CCC:1324). The Eucharist is the heart and the summit of the Church’s life, for in it Christ associates his Church and all her members with his sacrifice of praise and thanksgiving offered once for all on the cross to his Father; by this sacrifice he pours out the graces of salvation on his Body which is the Church (CCC:1407). At the heart of the Eucharistic celebration are the bread and wine that, by the words of Christ and the invocation of the Holy Spirit, become Christ’s Body and Blood. (CCC:1333).
First Holy Communion/Eucharist is generally celebrated in second grade for children and within the RCIA (Rite of Christian Initiation of Adults) program for adults.