The sacrifice acceptable to God is a broken spirit; a broken and contrite heart, O God, you will not despise.
Fasting is a different experience from missing your dinner by accident or through poverty. Fasting asserts the will against the appetite—the reward being self-mastery and the danger pride; involuntary hunger subjects appetites and will together to the Divine will, furnishing an occasion for submission and exposing us to the danger of rebellion. But the redemptive effect of suffering lies chiefly in its tendency to reduce the rebel will. Ascetic practices, which in themselves strengthen the will, are only useful in so far as they enable the will to put its own house (the passions) in order, as a preparation for offering the whole man to God.
Prayer: God, help me to remember that your command is to love you with all my heart, all my mind, and all my soul.