17:12 Elias is come already. John the Baptist, who came in the spirit and power of Elijah (Mr 1:2-8 Lu 1:17).
Have done unto him whatsoever they listed. List and lust were originally one word, meaninf to desire or wish. The account of his martyrdom is given in Mt 14:6-12 and Mr 6:21-29.
The Son of man suffer by them. Henceforth he keeps the lesson of his suffering constantly before their minds. After all, his disciples were not prepared for it when the hour came.
17:12 Elijah is come already - And yet when the Jews asked John, Art thou Elijah? He said, I am not, John 1:21. His meaning was, I am not Elijah the Tishbite, come again into the world. But he was the person of whom Malachi prophesied under that name.
17:1-13 Now the disciples beheld somewhat of Christ's glory, as of the only begotten of the Father. It was intended to support their faith, when they would have to witness his crucifixion; and would give them an idea of the glory prepared for them, when changed by his power and made like him. The apostles were overcome by the glorious sight. Peter thought that it was most desirable to continue there, and to go no more down to meet the sufferings of which he was so unwilling to hear. In this he knew not what he said. We are wrong, if we look for a heaven here upon earth. Whatever tabernacles we propose to make for ourselves in this world, we must always remember to ask Christ's leave. That sacrifice was not yet offered, without which the souls of sinful men could not have been saved; and important services were to be done by Peter and his brethren. While Peter spoke, a bright cloud overshadowed them, an emblem of the Divine presence and glory. Ever since man sinned, and heard God's voice in the garden, unusual appearances of God have been terrible to man. They fell prostrate to the earth, till Jesus encouraged them; when looking round, they beheld only their Lord as they commonly saw him. We must pass through varied experiences in our way to glory; and when we return to the world after an ordinance, it must be our care to take Christ with us, and then it may be our comfort that he is with us.
