From the Introduction to the Ash Wednesday Liturgy.

Brothers and sisters in Christ, since early days Christians have observed with great devotion the time of our Lord’s passion and resurrection and prepared for this by a season of penitence and fasting.

By carefully keeping these days, Christians take to heart the call to repentance and the assurance of forgiveness proclaimed in the gospel, and so grow in faith and in devotion to our Lord.

I invite you, therefore, in the name of the Church, to the observance of a holy Lent, by self-examination and repentance; by prayer, fasting, and self-denial; and by reading and meditating on God’s holy word.