The Precepts of the Church are the minimum obligations that all Catholics must fulfill. They are set by the Church's authority to ensure that the faithful maintain a basic level of prayer, sacramental life, and moral effort. The Catechism (CCC 2041-2043) lists five precepts: (1) Attend Mass on Sundays and Holy Days of Obligation, and rest from servile labor on those days. (2) Confess your sins at least once a year (the 'Easter duty' of Confession). (3) Receive the Eucharist at least during the Easter season (between the First Sunday of Lent and Trinity Sunday in the U.S.). (4) Observe the days of fasting and abstinence established by the Church (Ash Wednesday, Good Friday, and Fridays of Lent). (5) Help to provide for the needs of the Church according to one's ability (financial support, tithing, and other contributions). These precepts represent the bare minimum of Catholic practice — the Church strongly encourages far more frequent participation in the sacraments and a more robust prayer life. Failure to observe these precepts without serious reason may constitute a sin.