The reason Lent lasts 40 days is that 40 is the traditional number of judgment and spiritual testing in
the Bible (Gn 7:4, Ex 24:18, 34:28, Nm 13:25, 14:33, Jon 3:4). Lent bears particular relationship to
the 40 days Christ spent fasting in the desert before entering into his public ministry (Mt 4:1-11).
We imitate Christ by spending 40 days in spiritual discipline before the celebration of Christ’s
triumph over sin and death.
Fasting is a biblical discipline that can be defended from both the Old and the New Testament.
Christ expected his disciples to fast (Mt 9:14-15) and issued instructions for how they should do so
(Mt 6:16-18). We follow this pattern by holding a partial fast on Ash Wednesday and Good Friday.
Abstinence from certain foods is also a biblical discipline. In Daniel 10:2-3 we read, “In those days I,
Daniel, was mourning for three weeks. I ate no delicacies, no meat or wine entered my mouth, nor
did I anoint myself at all, for the full three weeks.” We use a practice similar to Daniel’s when, as a
way of commemorating Christ’s Crucifixion on a Friday, we abstain from eating meat on that day of
the week during Lent. The only kind of flesh we eat on Friday is fish, which is a symbol of Christ.
Even the Ash Wednesday practice of having one’s forehead signed with ashes has a biblical parallel.
Putting ashes on one’s head was a common biblical expression of mourning (1 Sm 13:19, Est 4:1, Is
61:3; see also Est 4:3, Jer 6:26, Ez 27:30, Dn 9:3, Mt 11:21, Lk 10:13). By having the sign of the cross
made with ashes on our foreheads, we mourn Christ’s suffering on the cross and our own sins,
which made that suffering necessary.