Matthew 16:21 says, From that time forth began Jesus to shew unto his disciples, how that he must go unto Jerusalem, and suffer many things of the elders and chief priests and scribes, and be killed, and be raised again the third day.  Jesus now began to prepare His disciples for what was ahead for Him.  Jesus told them that He must go to Jerusalem, suffer many things at the hands of the elders and chief priests and scribes, those who were supposedly God's representatives to His people.  This would ultimately lead to Jesus's death, burial and resurrection the third day, which He had already said was the only sign that would be given in order for people to accept Him as the Messiah.  It is still the only sign today.  We either accept this by faith, or Jesus has no meaning in our life.  Verse twenty-two declares, Then Peter took him, and began to rebuke him, saying, Be it far from thee, Lord: this shall not be unto thee.  Peter, whose faith had just been called a rock, now began to rebuke Jesus.  Peter still did not accept Who Jesus really was.  As followers of Christ, if we are led to a place of Christ suffering, must never rebuke, or question, the will of Christ.  We cannot make Jesus into anything other than Who He is if He is to truly be the Lord of our life.  In verse twenty-three Jesus says, But he turned, and said unto Peter, Get thee behind me, Satan: thou art an offence unto me: for thou savourest not the things that be of God, but those that be of men.  Having just praised Peter for his faith, Jesus now calls him Satan, because Peter was wanting the things of the world and not the will of God.  We must be careful that we never become the same way, pronouncing Christ as our Savior and Lord, but then desiring the things of the world more than we do following the will of God.  In verse twenty-four Jesus declares, Then said Jesus unto his disciples, If any man will come after me, let him deny himself, and take up his cross, and follow me.  As I have said before, this is about as far removed from a prosperity gospel as we can get.  God wants us to be happy, not because of material wealth, but because we are saved by Christ.  Verse twenty-five continues, For whosoever will save his life shall lose it: and whosoever will lose his life for my sake shall find it.  I believe that Jesus is telling us that if we live for earthly satisfaction above living for by will of God, then we may gain a lot materially, but we will lose our everlasting life with God.  Not even saving our physical life should come between God and us.  Verse twenty-six declares, For what is a man profited, if he shall gain the whole world, and lose his own soul? or what shall a man give in exchange for his soul?  Once more, Jesus tells us nothing, even the riches of the whole world, should come between God and us.  The richest person in the world, if that person does not accept Jesus as Savior, loses their immortal soul, and everything they own, when they die.  Verse twenty-seven states, For the Son of man shall come in the glory of his Father with his angels; and then he shall reward every man according to his works.  This does not mean that we work for our salvation, but that the things that we do for God after we are saved will be rewarded.  Salvation is a free gift, but we do then have a responsibility to do the work that God calls us to do.  Verse twenty-eight says, Verily I say unto you, There be some standing here, which shall not taste of death, till they see the Son of man coming in his kingdom.  I do not believe that Jesus was referring to the second coming, but to His ascension into heaven after His death and resurrection.  This was truly the beginning of the kingdom of Christ.