Transubstantiation cannot be proved through scientific experimentation. If we were to respectfully examine a consecrated host using a microscope, the physical attributes of bread would be obvious. If we were to do to the same with the precious blood, the physical attributes would be that of wine.
Transubstantiation belongs to the reality of faith. Faith does not contradict reason. Instead, the gift of faith that we receive at Baptism, gives us a superior vision.
Transubstantiation means "change of substance", or "change of reality." When the priest repeats the words that Jesus spoke at the Last Supper, the bread is no longer bread, and the wine is no longer wine. Instead, the entire substance of the bread and the entire substance of the wine have been changed into the substance of The Body and Blood of Christ.
Transubstantiation occurs only by the power of God, and in a way that we cannot empirically detect. We know that transubstantiation takes place through the certainty of faith.
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