The purpose of the sacraments is to make people holy, to build up the Body of Christ, and finally to give worship to God; but being signs they also have a teaching function. They not only presuppose faith, but by words and objects they also nourish, strengthen, and express it; that is why they are called "sacraments of faith." They do indeed impart grace, but in addition the very act of celebrating them disposes the faithful most effectively to receive this grace in a fruitful manner, to worship God rightly, and to practice charity. It is therefore of the greatest importance that the faithful should readily understand the sacramental signs and should with great eagerness frequent those sacraments that were instituted to nourish the Christian life.
-- Constitution on the Liturgy Chapter III: The Other Sacraments and the Sacramentals 59.