"The visible reality we see in the Sacraments is their outward expression, the form they take, and the way in which they are administered and received. The invisible reality we cannot "see" is God's grace, his gracious initiative in redeeming us through the death and Resurrection of his Son. His initiative is called grace because it is the free and loving gift by which he offers people a share in his life, and shows us his favor and will for our salvation. Our response to the grace of God's initiative is itself a grace or gift from God by which we can imitate Christ in our daily lives." (USCCB)
The whole liturgical life of the Church revolves around the Eucharistic sacrifice and the sacraments. (CCC 1113)
While we believe that human life is infused with the sacramental goodness of God, the Catholic Church has defined seven sacraments - instituted by and through the life of Jesus Christ. It is through the experience of the sacramental ritual that we are infused with God’s grace. The Sacraments nourish and strengthen us as they express and build up our faith.