From the earliest times down to this day, these weeks before Easter have been set apart every year, for the particular remembrance and confession of our sins. From the first age downward, not a year has passed but Christians have been exhorted to reflect how far they have let go their birthright, as a preparation for their claiming the blessing. At Christmas we are born again with Christ; at Easter we keep the Eucharistic Feast. In Lent, by penance, we join the two great sacraments together. Are you, my brethren, prepared to say,—is there any single Christian alive who will dare to profess,—that he has not in greater or less degree sinned against God's free mercies as bestowed on him in Baptism without, or rather against his deserts? Who will say that he has so improved his birthright that the blessing is his fit reward, without either sin to confess, or wrath to deprecate? See, then, the Church offers you this season for the purpose. "Now is the accepted time, now the day of salvation." Now it is that, God being your helper, you are to attempt to throw off from you the heavy burden of past transgression, to reconcile yourselves to Him who has once already imparted to you His atoning merits, and you have profaned them.
Bl. John Henry Newman, Life the Season of Repentance