It is correct for a wise son to make his parents happy, and he should anticipate that they will ask him to do something so that he can fulfil a biblical commandment. Even if the thing they have asked is difficult for him, he must realize that the magnitude of reward depends on the level of difficulty in fulfilling it. He will also receive a reward in this world, for he will have good children, and even if that is all the reward that he will get, it is enough to cause a person to toil with his twenty nails in order to merit this reward. If Hashem has given the son wealth, and his father is a poor man, it is incumbent on the son to sustain him and give him all his needs with a pleasant face, together with nice words and in an honorable way.
