We see, then, that grace is more powerful than nature, and so far, we've only discussed the grace of a prophet's blessing. But if a man's blessing could change nature, what should we say about the divine consecration where the words of the Lord and Savior are at work? The sacrament you receive is made what it is by the word of Christ.

This reveals the handiwork of the true Creator (the Son), as the fluid became solid and the rock flowed with water. The Apostle confirmed this, saying: "And that rock was Christ."

The people of the fathers thirsted, Moses touched the rock, and water flowed out of the rock. Did not grace work a result contrary to nature, so that the rock poured forth water, which by nature it did not contain?

It does not surpass faith that a virgin gave birth, when we read that even a rock poured out water and that the waves of the sea were made solid in the form of a wall.

Dig in this rocky patch of ground, right in the middle of the pavement of my dwelling, trusting that the Lord God is able to bring water out of hard rock for those who pray to Him, just as He gave water to the thirsty people when Moses struck the rock with his staff, and again provided water for Samson, when he was parched, from the jawbone of a donkey.

Then the Lord said to Moses, “Take the staff and strike the rock, that it may produce water for the people.” Behold, there is a rock, and it contains water. However, unless this rock is struck, it does not have any water at all. But when it has been struck, it produces fountains and rivers, as we read in the Gospel: “He who believes in me, from within him there shall flow rivers of living water.” When Christ was struck on the cross, he brought forth the fountains of the New Testament. Therefore it was necessary for him to be pierced. If he had not been struck, so that water and blood flowed from his side, the whole world would have perished through suffering thirst for the word of God.

When Moses was silent, he was crying out; when he appeared at ease, he was actually fighting—not just fighting but winning against enemies he never even approached. He was so at ease that others had to hold up his hands, yet he was more active than anyone, for he, with his hands at rest, was defeating the enemy whom those in battle could not overcome. So, Moses spoke even in silence and worked hard even when at rest.

For in this way, when the eyes are lifted up through thought and contemplation and the hands are lifted up in deeds which lift up and exalt the soul, as Moses lifted up his hands, one may consequently say, “The lifting up of my hands is as the evening sacrifice.” In this way the Amalekites and all the unseen enemies will be worsted, and the Israelite reasonings in us will prevail.

For my own warfare, however, I am at a loss what course to pursue, what alliance, what word of wisdom, what grace to devise, with what panoply to arm myself against the wiles of the wicked one. What Moses did is to conquer him by stretching out his hands upon the mount, in order that the cross, thus typified and prefigured, may prevail.

But, to come now to Moses, why, I wonder, did he merely at the time when Joshua was battling against Amalek, pray sitting with hands expanded, when, in circumstances so critical, he ought rather, surely, to have commended his prayer by knees bent, and hands beating his breast, and a face prostrate on the ground; except it was that there, where the name of the Lord Jesus was the theme of speech—destined as he was to enter the lists one day singly against the devil—the figure of the cross was also necessary, [that figure] through which Jesus was to win the victory?

When Moses’ hands were lifted up Amalek was conquered; when they came down a little he grew strong. The sailyards of ships and the ends of the sailyards move about in the form of our cross. The very birds, too, when they are borne to the heights and fly through the air, imitate the cross with their wings outstretched. Trophies themselves are crosses, and so are adorned victories of triumphs. These we ought to have not only on our foreheads but also on our souls so that, thus armed, we may trample upon the adder and the serpent, in Christ Jesus, to whom be glory forever.

In truth it was not because Moses prayed that his people were victorious, but because, while the name of Jesus was at the battle front, Moses formed the sign of the cross. Who among you does not know that that prayer is the most pleasing to God which is uttered with lamentation and tears? But on this occasion Moses (or any after him) did not pray in such a manner; he was seated on a stone. And I have shown that even the stone is symbolical of Christ.

Besides, the fact that the prophet Moses remained until evening in the form of the cross, when his hands were held up by Aaron and Hur, happened in the likeness of this sign. For the Lord also remained upon the cross until evening, when he was buried. Then he rose from the dead on the third day.

When Moses sat on the stone, it prefigured the law resting on the church. But this law had heavy hands, because it did not deal mercifully with those who were sinners but treated them with extreme harshness. “Aaron” means “mountain of strength,” and “Hur” means “fire.” Who is meant by “mountain of strength”? Our Redeemer, of whom the prophet said, “It shall come to pass in the latter days that the mountain of the house of the Lord shall be established as the highest of the mountains.” And who is prefigured by “fire” but the Holy Spirit, of whom our Redeemer said, “I have come to cast fire upon the earth”? Aaron and Hur support the heavy hands of Moses and make them lighter by their support. Similarly the “Mediator between God and men,” coming with the fire of the Holy Spirit, revealed that the heavy commandments of the law, which cannot be borne when taken literally, become more tolerable for us when they are understood spiritually. It is as if he made the hands of Moses light when he changed the weight of the law’s commandments into the strength that comes from confession.

See how the type was given through Moses but the truth came through Jesus Christ. And again, on Mt. Sinai, when the Amalekites were waging war on the Hebrews, the hands of Moses were propped up, held by Aaron and Hur standing on either side. But Christ, when he came, himself held his hands extended on the cross by his own power. Do you see how the type “was given” and “the truth came”?

Moses showed this when his hands became so heavy that Joshua the son of Nun could hardly hold them up. For that reason the people conquered when they performed works not carelessly but with full consideration and virtue—not with faltering souls nor with a wavering disposition but with the stability of a firm mind.