We give because Jesus already gave his life for us.  

We aren’t giving to get; we are giving because we have already received everything in Jesus. We get to worship Jesus with our money. And we give because we want to see more people worship him, too. The truth is Jesus doesn't need our money, but he invites us to be a part of his kingdom expansion, his mission. Don’t give if you think you have to; give because we get to by grace.