The central act of devotional life in the Catholic Church is the Holy Sacrifice of the Mass.
The sacrifice of the Mass is the unbloody repetition of the Sacrifice of the Cross.
On the Cross of Calvary Christ gave His life to redeem the world.
The life of Christ was a life of sacrifice.
The life of a Christian must be a life of sacrifice.
We cannot imitate the sacrifice of Christ on Calvary by trying to get all we can.
We can only imitate the sacrifice of Christ on Calvary by trying to give all we can.

From Easy Essays by Peter Maurin, co-founder of the Catholic Worker Movement with Dorothy Day.