Wow! I just learned the most awesome idea about schar and I have to share it with the CR!
How much schar a person will receive for his Mitzvos is proportional to his bitachon that he will receive schar for his Mitzvos. The more bitachon you have that you will receive schar for your Mitzvos, the more schar you will in fact receive!!!!!!
source: Sifsei Chaim – Rinas Chaim (“b’iurei tefilas Shemona Esrei”), p. 171 (based on the Maharal, Chidushei Agados, Sotah 48b)