The Lenten rules about fasting from food and abstaining from meat have been considerably reduced in the last forty years, but reminders of them remain in the fast days on Ash Wednesday and Good Friday and in the abstinence from meat on all the Fridays of Lent. Beyond these common sacrifices that unite us spiritually to the passion of Christ, Catholics were and are encouraged to “give up” something voluntarily for the sake of others. Often this is money that could have been used for personal purposes and instead is given to help others, especially the poor.

This year, the Catholic Church in the United States is being told she...