From The Little Catechism of the Curé of Ars (Tan Books)

All good works together are not of equal value with the sacrifice of the Mass, because they are the works of men, and the holy Mass is the work of God. Martyrdom is nothing in comparison; it is the sacrifice that man makes of his life to God; the Mass is the sacrifice that God makes to man of His Body and of His Blood. Oh, how great is a priest! if he understood himself he would die. God obeys him; he speaks two words, and Our Lord comes down from Heaven at his voice, and shuts Himself up in a little Host. God looks upon the altar. “That is My well- beloved Son’ He says, “in whom I am well- pleased.” He can refuse nothing to the merits of the offering of this Victim. If we had faith, we should see God hidden in the priest like a light behind a glass, like wine mingled with water.

...If someone said to us, “At such an hour a dead person is to be raised to life,” we should run very quickly to see it. But is not the Consecration, which changes bread and wine into the Body and Blood of God, a much greater miracle than to raise a dead person to life? We ought always to devote at least a quarter of an hour to preparing ourselves to hear Mass well; we ought to annihilate ourselves before God, after the example of His profound annihilation in the Sacrament of the Eucharist; and we should make our examination of conscience, for we must be in a state of grace to be able to assist properly at Mass. If we knew the value of the holy Sacrifice of the Mass, or rather if we had faith, we should be much more zealous to assist at it.