This verse sums up Jesus Christ, His life and death, ministry and mission.  He called Himself the 'Son of Man' for two reasons: firstly, because He was fully human as well as being fully God; secondly, 'Son of Man' was a Messianic title.  Daniel 7:13-14 says, ‘In my vision at night I looked, and there before me was one like a son of man, coming with the clouds of heaven. He approached the Ancient of Days and was led into his presence. He was given authority, glory and sovereign power; all nations and peoples of every language worshipped him.

Jesus was telling a parable to correct the popular idea that the Messiah’s role was to liberate Israel from Roman rule.  It also sets the scene for Jesus’ second coming (Luke 19:11-27).  In this story, Jesus is the King and His servants represent those who were entrusted with the gospel (1 Thessalonians 2:4).  They were commissioned to look after His kingdom on earth when He returned to heaven.  

Most people assume that the processes of life will continue more or less predictably (2 Peter 3:3-4); and that there is no final end point at which everything will be disclosed, assessed, rewarded or punished.  Even some followers of Jesus know He will return but get on with their lives as though that fact does not matter (2 Peter 3:11-13).  So Jesus teaches in this parable (Luke 19:11-27) about the dangers of unproductive faith and of being an enemy of Christ.
 

Two of the disciples searched for the donkey Jesus had described (Luke 19:30); they really had no idea what they were getting into.  All they were doing was obeying Jesus.  As they untied the animal, the owners came up and asked them what they were doing.  They said exactly what Jesus had told them to say, which the owners accepted as their authority to take the donkey away.  And so they brought it to Jesus just as He had commanded them.