Rabbi Hananya made a statement that puzzled his students: "Some people feed their parents badly and yet inherit Paradise. Others feed their parents well and yet inherit Gehinnom (the place of spiritual purification after death)." How could this be? Surely the quality of care determined the reward?
The answer, as the Talmud explains, lies not in the food but in the heart behind it. A man who serves his father the finest meats and wines, but does so grudgingly, with resentment in his voice and contempt in his eyes — that man feeds his father well and earns Gehinnom. The food nourishes the body while the attitude poisons the soul.
Another man puts his father to work grinding at a millstone — hard, exhausting labor. But he does it to spare his father from something worse: conscription into the king's forced labor gangs, where the work is brutal and the overseers are cruel. "Better you grind here at home, Father, where I can watch over you, than in the king's camp where they will show you no mercy." This man feeds his father badly — with humble food and difficult work — but inherits Paradise, because every hardship he imposed was an act of protection.
God does not weigh the meal. He weighs the intention. A golden plate served with a sneer is worth less than a crust of bread offered with love. The father who eats plain food from a devoted son is better fed than the father who feasts at the table of a resentful one.
This teaching became a cornerstone of Jewish ethics: the mitzvah is in the motive. You can perform every commandment perfectly and still miss the point entirely if your heart is not in it.