what does........

I've never heard that before, so, although it is correct English, it is not necessarily prosaic. (Not that i'm the ultimate source, but i don't think that is a common expression in English.)

Reading it here for the first time, i suspect that the author intends to imply that anyone who is determined (to acheive their goals?) and generous can expect that unforeseen benefits will accrue to them.

It sounds a bit like it came from a fortune cookie. I'm still try to figure out what an expected surprise might be.