Trusting in GD in regard to what He promised the righteous concerning reward in this world and the next for their devotion, that He will grant it to those who deserve it, and also punish those who deserve it, is incumbent upon the believer. Trusting in GD in this matter is essential to perfect faith in GD. A person should not rely on his good conduct and confidently assure himself that he will be rewarded for it here and hereafter. Rather, he should be active and vigorous in showing gratitude for the Creator's favor continually bestowed upon him, but not out of hope for future reward that will be due him for his actions.
pg 445
pg 445