I cannot say for a fact that your contributing to our campaign will make you wiser, or wittier, or more beautiful. (As we both know, there is barely any room for improvement.) I can’t state for certain that a donation from you will mean that you will win the lottery next week, or that you will go to heaven at some indeterminate point after that.
Leaving that aside, here is what I can tell you, for sure: your hard-earned cash goes toward justice, equality and peace. And those things are priceless.