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" Curiously enough, it is a fear of how grace will change and improve them that keeps many souls away from God. They want God to take them as they are and let them stay that way. They want Him to take away their love of riches, but not their riches—to purge them of the disgust of sin, but not of the pleasure of sin. Some of them equate goodness with indifference to evil and think that God is good if He is broad-minded or tolerant about evil. Like the onlookers at the Cross, they want God on their terms, not His, and they shout, “Come down, and we will believe.” But the things they ask are the marks of a false religion: it promises salvation without a cross, abandonment without sacrifice, Christ without his nails. God is a consuming fire; our desire for God must include a willingness to have the chaff burned from our intellect and the weeds of our sinful will purged. The very fear souls have of surrendering themselves to the Lord with a cross is an evidence of their instinctive belief in His Holiness. Because God is fire, we cannot escape Him, whether we draw near for conversion or flee from aversion: in either case, He affects us. If we accept His love, its fires will illumine and warm us; if we reject Him, they will still burn on in us in frustration and remorse. "
― Fulton J. Sheen , Peace of Soul: Timeless Wisdom on Finding Serenity and Joy by the Century's Most Acclaimed Catholic Bishop
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" Why did Our Blessed Lord use bread and wine as the elements of this Memorial? First of all, because no two substances in nature better symbolize unity than bread and wine. As bread is made from a multiplicity of grains of wheat, and wine is made from a multiplicity of grapes, so the many who believe are one in Christ. Second, no two substances in nature have to suffer more to become what they are than bread and wine. Wheat has to pass through the rigors of winter, be ground beneath the Calvary of a mill, and then subjected to purging fire before it can become bread. Grapes in their turn must be subjected to the Gethsemane of a wine press and have their life crushed from them to become wine. Thus, do they symbolize the Passion and Sufferings of Christ, and the condition of Salvation, for Our Lord said unless we die to ourselves we cannot live in Him. A third reason is that there are no two substances in nature which have more traditionally nourished man than bread and wine. In bringing these elements to the altar, men are equivalently bringing themselves. When bread and wine are taken or consumed, they are changed into man's body and blood. But when He took bread and wine, He changed them into Himself. "
― Fulton J. Sheen , Life of Christ