A rich man and his stewardJesus told his disciples: “There was a rich man whose steward was accused of wasting his possessions. So he called him in and asked him, ‘What is this I hear about you? Give an account of your management, because you cannot be steward any longer.’ “The steward said to himself, ‘What shall I do now? My master is taking away my job. I’m not strong enough to dig, and I’m ashamed to beg—I know what I’ll do so that, when I lose my job here, people will welcome me into their houses.’ “So he called in each one of his master’s debtors. He asked the first, ‘How much do you owe my master?’ “‘Nine hundred gallons of olive oil,’ he replied. “The steward told him, ‘Take your bill, sit down quickly, and make it four hundred and fifty.’ “Then he asked the second, ‘And how much do you owe?’ “‘A thousand bushels of wheat,’ he replied. “He told him, ‘Take your bill and make it eight hundred.’ “The master commended the dishonest steward because he had acted shrewdly. For the people of this world are more shrewd in dealing with their own kind than are the people of the light. I tell you, use worldly wealth to gain friends for yourselves, so that when it is gone, you will be welcomed into eternal dwellings. “Whoever can be trusted with very little can also be trusted with much, and whoever is dishonest with very little will also be dishonest with much. So if you have not been trustworthy in handling worldly wealth, who will trust you with true riches? And if you have not been trustworthy with someone else’s property, who will give you property of your own?10. What is the main idea of the passage？