God mostly uses money in our lives as a good training device for other, more important matters. We do not mean to let it happen, but sometimes we get more attached than we should to material things. The new truck, the latest electronic gizmo, that new set of living room furniture, or a tropical vacation may not be as important as they seem. When we cannot afford something and have to live without it, we discover that we did not have to have it to live well. God is not interested in withholding nice things from us just to teach us that we do not need nice things.
Nice things are nice.
A good God, like a good parent, takes the splinter out of the child's hand even if it hurts a little in the process. Jesus explains that we determine the future level and flow of resource toward us by what we give out from ourselves to others. If we know we are going to be short of cash in the future, we may want to be generous with it now. Perhaps the best image I can use to explain this principle is a bottle of Coke or Pepsi. Even though the federal government can print all the money it wants to print, it cannot spend more than it has without dire consequences.