The 12 men who spent roughly two extraordinary years in the company of our Lord during His earthly ministry, often had difficulty understanding the nature of the spiritual commitment that Jesus demanded. Their struggles are emblematic of the same spiritual obstacles we often face today.
In Luke 9, Jesus sent out these 12 men on a limited mission, preparing them for the obstacles they would face when He was gone. When they returned, Jesus began to seriously prepare them for what lay ahead, and the spiritual challenges they would encounter. He foretold His death (9:21-22), He exhorted them in the nature of true discipleship (9:23-27), and then He foretold His death again (9:43-45). Meanwhile, the disciples argued about who was greatest. It must have been maddening for Jesus to see this. In the closing verses of the chapter, Jesus got down to brass tacks: the cost of service.
Foxes have holes, and birds of the air have nests, but the Son of Man has nowhere to lay his head. – Luke 9.58