One of the great qualities of Christian maturity is generosity. Generosity is about stretching and growing and reaching a little further than you did last time. This is true of our wealth, yes, but also our energy and time and resources and talents and forgiveness and love.
We don't encourage this because it's obligatory or we trying to guilt you. We're responding to a generous God! Look at all he has given you (everything you have and possess in this life including the air in your lungs and the money in your account). He has entrusted to us all we have to advance his influence. So let's use it wisely and generously.
One simple and practical way you can do this is by helping us accomplish our mission through serving and giving.