Good conduct does not insure reward. The key is showing GRATITUDE for all the good grace H'shem bestows upon us at every moment. This gratitude should not be used as a tool to try and insure his reward. As Rabbenu Bachya teaches "He should trust in GD after doing his best to repay the debt of gratitude he owes the Creator for His kindness toward him. As it says in Perke Avot (1:3) "Be not like the servant who serve the master on condition of receiving a reward, but be like the servants who serve the master NOT on condition of receiving a reward, and let the fear of Heaven be upon you.
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