Matthew 16:21-23 (NIV)
21From that time on Jesus began to explain to his disciples that he must go to
Jerusalem and suffer many things at the hands of the elders, chief priests and
teachers of the law, and that he must be killed and on the third day be raised
to life. 22 Peter took him aside and began to rebuke him. "Never, Lord!" he
said. "This shall never happen to you!" 23 Jesus turned and said to Peter, "Get
behind me, Satan! You are a stumbling block to me; you do not have in mind the
things of God, but the things of men."

Jesus had been preparing the disciples for His death. And now He was explaining
how He would suffer, be killed and raised to life on the third day. Earlier
Peter had told Jesus that Jesus was the Christ and now Peter is saying never
shall this happen to you. Jesus just said He will be raised back to life, yet
Peter is saying "this shall never happen to you". No wonder Jesus calls out
Satan and says to Peter that he is a stumbling block. Peter is thinking of
himself and not God's purpose, which was revealed to him earlier.

Have you ever started out on a shopping trip to buy something for another
person and ended up buying something for yourself? The purpose of the trip was
for the other person, but somehow the priority changed and you focused on
yourself and ended up taking home something for you instead? We do that with
God's purpose for our lives. He reveals what He wants us to obtain for our life
and then we buy into something else. We end up following our temptations. Pray
that Christ would protect you from satan's temptations. Follow His purpose for
your life and not your own priorities. Let His will, His love, His care, His
work flow in your life. God bless you and have a wonderful day.