Thus the saying of the psalm would be fulfilled: "Their sound has gone out through all the earth" (Ps 18:5). Indeed, it would not have been enough to encourage them by His example, unless He had also filled them with His Spirit. At last the Apostle Peter had already heard His words: "A servant is not greater than his master. If they persecuted Me, they will also persecute you" (Jn 15:20). He had already seen fulfilled in Him what he was to imitate, if example alone had been enough: the patience of his Lord. Yet he did not stand firm, but denied Him. Clearly he was unable to endure what he saw the Lord endure. But when he was endowed with the Holy Spirit, he began to preach Him whom he had denied. He was not afraid to proclaim openly the One whom before he had feared to confess. By the example he had already been instructed to do what he had learned. Yet he had not yet been given the strength to do what he had learned. He had been taught to be steadfast, but he had not been strengthened so as not to fall. After this latter gift was given through the Holy Spirit, he preached the Lord even to death. At first he had denied Him from fear of death. Therefore, in the next chapter, which we must discuss with you, the Lord said: "These things I have spoken to you, that you should not be made to stumble." For it is sung in the psalm: "Great peace have those who love Thy law, and nothing causes them to stumble" (cf. Ps 118:165). Therefore, after promising the Holy Spirit, by whose action in them they would bear witness of Him, He rightly added: "These things I have spoken to you. That you should not be made to stumble." For when "the love of God has been poured into our hearts by the Holy Spirit who was given to us" (Rom 5:5), great peace arises in those who love God's law, so that nothing causes them to stumble.