Luke 12 tells us of the rich fool who had a bumper harvest and planned to build bigger barns to store his grain. He thought he was set up for life; well, he was, a life of just a few hours! There is nothing wrong with Christians being rich. They’ve probably worked very hard for their money and it has paid dividends. The responsibility is then what to do with these riches.
I know of Christian philanthropists who at the time of their death had very little wealth and money but had given away vast sums of money and had set up trusts for the needy in their name. The answer is not building bigger barns. Many lottery winners are the most unhappy people. As I once heard said, ‘Don’t build bigger barns, build a bigger table.’