When Jesus demanded voluntary poverty of the rich young man, the young man knew that his only choices were obedience or disobedience…

When Levi was called from tax collecting and Peter from his nets, there was not doubt that Jesus was serious about those calls. They were supposed to leave everything and follow him… Only one thing was demanded in each of these cases. That was their entrusting themselves to the word of Jesus Christ, believing it to be a stronger foundation than all the securities of the world… It was God’s own word. Simple obedience was required.  — Dietrich Bonhoeffer, Discipleship