That’s not how I interpret that line. I’m pretty sure he means that if you act like a hypocrite, the scorn and derision of the people you are annoying that you get here in life is the only reward you can expect, and no further reward will be gained in the afterlife.

However, if you follow the rules, are a good person, and most importantly don’t go around boasting about how good you are, then you’ll receive a greater reward after death, than any earthly reward that us lowly humans could give you.