18 One time when Jesus was off praying by himself, his disciples nearby, he asked them, "What are the crowds saying about me, about who I am?" 19 They said, "John the Baptizer. Others say Elijah. Still others say that one of the prophets from long ago has come back." 20 He then asked, "And you - what are you saying about me? Who am I?" Peter answered, "The Messiah of God."
21 Jesus then warned them to keep it quiet. They were to tell no one what Peter had said. 22 He went on, "It is necessary that the Son of Man proceed to an ordeal of suffering, be tried and found guilty by the religious leaders, high priests, and religion scholars, be killed, and on the third day be raised up alive."
Matthew Henry's Commentary on Luke 9:18-22
Commentary on Luke 9:18-27
(Read Luke 9:18-27)
It is an unspeakable comfort that our Lord Jesus is God's Anointed; this signifies that he was both appointed to be the Messiah, and qualified for it. Jesus discourses concerning his own sufferings and death. And so far must his disciples be from thinking how to prevent his sufferings, that they must prepare for their own. We often meet with crosses in the way of duty; and though we must not pull them upon our own heads, yet, when they are laid for us, we must take them up, and carry them after Christ. It is well or ill with us, according as it is well or ill with our souls. The body cannot be happy, if the soul be miserable in the other world; but the soul may be happy, though the body is greatly afflicted and oppressed in this world. We must never be ashamed of Christ and his gospel.