In concluding these warnings Jesus returned to the subject of humility that He had stressed with His disciples earlier (cf. Matthew 18:4; Matthew 20:20-28). Jesus taught His disciples to be servants of others, not lords over them. [source][source][source]
"Leadership positions should never be a goal in and of themselves, but should always be viewed as opportunities to serve others." [1][source]
The reversal of fortunes that Jesus predicted here will happen when the kingdom begins. Jesus Himself was the greatest example of what He taught here (cf. Matthew 20:26-28; Philippians 2:5-11). [source][source][source]