What happens when your tank is empty, and you’ve got nothing left to give?

Today I happen to read the article “Charitable giving by country: who is the most generous? ” Then this question came up. When it comes to generosity, sometimes people look at what they’ve got and they’d like to be able to give much more. They’d like to make a more impressive offering, but their means are limited. So they have to content themselves with giving limited gifts. So what do you think happens when your tank is empty, and you’ve got nothing left to give?