Man at Bethesda
Jesus' opening question to this man is critical: "Do you want to be healed?" It is clear that this man needed to be healed. But after thirty-eight years, it wasn't clear that he wanted to be healed. Elsewhere, Jesus says, "Those who are well do not want a physician, but those who are sick. I came not to call the righteous, but sinners." -- before Jesus is able to help us, it requires, at a minimum, to have a glimmer of our need.

Curiously, the sick man gives no direct answer to the question. Instead of addressing the ends (i.e., being healed -- what Jesus has asked about), he has a means in mind, and is fixated on that. We do that, too. All the time. We ignore God's way, and insist upon our own, in spite of the repeated experience that our way inevitably leads to frustration and failure.

Jesus ignores the ideas of the suffering man. Instead, he provides direct healing. Sure: his command is to be obeyed, but obedience isn't the cause of the healing. Rather, obedience is the effect of the healing.
John 5:2 (ESV) Now there is in Jerusalem by the Sheep Gate a pool, in Aramaic called Bethesda, which has five roofed colonnades. 3 In these lay a multitude of invalids—blind, lame, and paralyzed. 5 One man was there who had been an invalid for thirty-eight years. 6 When Jesus saw him lying there and knew that he had already been there a long time, he said to him, “Do you want to be healed?” 7 The sick man answered him, “Sir, I have no one to put me into the pool when the water is stirred up, and while I am going another steps down before me.” 8 Jesus said to him, “Get up, take up your bed, and walk.” 9 And at once the man was healed, and he took up his bed and walked.
Now that day was the Sabbath. 
10 So the religious leaders said to the man who had been healed, “It is the Sabbath, and it is not lawful for you to take up your bed.” 
14 Afterward Jesus found him in the temple and said to him, “See, you are well! Sin no more, that nothing worse may happen to you.” 15 The man went away and told the religious leaders that it was Jesus who had healed him. 16 And this was why the religious leaders were persecuting Jesus, because he was doing these things on the Sabbath. 17 But Jesus answered them, “My Father is working until now, and I am working.” 18 This was why the religious leaders were seeking all the more to kill him, because not only was he breaking the Sabbath, but he was even calling God his own Father, making himself equal with God.
But what about this business of the Sabbath? According to the ten commandments, the Sabbath was to be kept holy, and observant Jews avoid work on the Sabbath to this day. By reporting back to the religious leaders, the healed man was acknowledging their authority over the Sabbath -- and, indeed, over Jesus. Unfortunately, religious leaders to this day would similarly like to subordinate Jesus! Instead, we need to recognize that Jesus is the ultimate authority -- “The Son of Man is lord of the Sabbath.” It is not a clever move to demote the only one who has the power to heal completely.