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
From various writings on the history of the Order of Preachers