In this weeks Parsha (Torah portion) we find the sin of the golden calf. While almost all the Jews were a part of this sin, Aharon was not. Rashi says that this is the reason that he and all his offspring get to serve in the Beit Hamikdash as cohanim rather than the first born sons getting this honor.
This is one example of getting a reward for your actions in this world. However most of us are not rewarded in this world but rather in the world to come. So how do we interpret this and use it in our own lives?
when Aharon HaKohan protested the creation and worship of the golden calf he did not know that he would get his reward in this world, but rather that his opinion was very unpopular and he stuck with it anyways. So too in our lives, we should not just do good deeds simply for the reward. Rather, we should do mitzvot and acts of kindness because they are the right thing to do and we can trust that our reward will be given to us in the World To come.