A person is apt to think, "Why should I perform actions that bring me no return? Why should I be kind, where no kindness is shown to me, where there is even no appreciation?" In this way he commercializes his kindness: he gives in order to receive. This blindness comes upon man, and it makes him blind even towards God. He thinks, "Why should I be grateful to God? There is nothing to be grateful for. If the sun shines, it is natural. If I have what I need for my living, I work for it all day"; or else, "I belong to such a family where it is natural that everything should be provided for me."