He ministered the sacred blood of Christ

The Roman Church commends to us today the anniversary of the triumph of Saint Lawrence. For on this day he trod the furious pagan world underfoot and flung aside its allurements, and so gained victory over Satan’s attack on his faith.
As you have often heard, Lawrence was a deacon of the Church at Rome. There he ministered the sacred blood of Christ; there for the sake of Christ’s name he poured out his own blood. Saint John the apostle was evidently teaching us about the mystery of the Lord’s supper when he wrote: Just as Christ laid down his life for us, so we ought to lay down our lives for the brethren. My brethren, Lawrence understood this and, understanding, he acted on it. Just as he had partaken of a gift of self at the table of the Lord, so he prepared to offer such a gift. In his life he loved Christ; in his death he followed in his footsteps.
Brethren, we too must imitate Christ if we truly love him. We shall not be able to render better return on that love than by modeling our lives on his. Christ suffered for us, leaving us an example, that we should follow in his steps. In saying this, the apostle Peter seems to have understood that Christ suffered only for those who follow in his steps, in the sense that Christ’s passion is of no avail to those who do not. The holy martyrs followed Christ even to shedding their life’s blood, even to reproducing the very likeness of his passion. They followed him, but not they alone. It is not true that the bridge was broken after the martyrs crossed; nor is it true that after they had drunk from it, the fountain of eternal life dried up.
I tell you again and again, my brethren, that in the Lord’s garden are to be found not only the roses of his martyrs. In it there are also lilies of the virgins, the ivy of wedded couples, and the violets of widows. On no account may any class of people despair, thinking that God has not called them. Christ suffered for all. What the Scriptures say of him is true: He desires all men to be saved and to come to knowledge of the truth.
Let us understand, then, how a Christian must follow Christ even though he does not shed his blood for him, and his faith is not called upon to undergo the great test of the martyr’s sufferings. The apostle Paul says of Christ our Lord: Though he was in the form of God he did not consider equality with God a prize to be clung to. How unrivaled his majesty! But he emptied himself, taking on the form of a slave, made in the likeness of men, and presenting himself in human form. How deep his humility!
Christ humbled himself. Christian, that is what you must make your own. Christ became obedient. How is it that you are proud? When this humbling experience was completed and death itself lay conquered, Christ ascended into heaven. Let us follow him there, for we hear Paul saying: If you have been raised with Christ, you must lift your thoughts on high, where Christ now sits at the right hand of God.

From various writings on the history of the Order of Preachers
He spoke with God or about God

Dominic possessed such great integrity and was so strongly motivated by divine love, that without a doubt he proved to be a bearer of honor and grace. He was a man of great equanimity, except when moved to compassion and mercy. And since a joyful heart animates the face, he displayed the peaceful composure of a spiritual man in the kindness he manifested outwardly and by the cheerfulness of his countenance.

Wherever he went he showed himself in word and deed to be a man of the Gospel. During the day no one was more community-minded or pleasant toward his brothers and associates. During the night hours no one was more persistent in every kind of vigil and supplication. He seldom spoke unless it was with God, that is, in prayer, or about God, and in this matter he instructed his brothers.

Frequently he made a special personal petition that God would deign to grant him a genuine charity, effective in caring for and obtaining the salvation of men. For he believed that only then would he be truly a member of Christ, when he had given himself totally for the salvation of men, just as the Lord Jesus, the Savior of all, had offered himself completely for our salvation. So, for this work, after a lengthy period of careful and provident planning, he founded the Order of Friars Preachers.

In his conversations and letters he often urged the brothers of the Order to study constantly the Old and New Testaments. He always carried with him the gospel according to Matthew and the epistles of Paul, and so well did he study them that he almost knew them from memory.

Two or three times he was chosen bishop, but he always refused, preferring to live with his brothers in poverty. Throughout his life, he preserved the honor of his virginity. He desired to be scourged and cut to pieces, and so die for the faith of Christ. Of him Pope Gregory IX declared: “I knew him as a steadfast follower of the apostolic way of life. There is no doubt that he is in heaven, sharing in the glory of the apostles themselves.”

via divineoffice.org