The Chovot HaLevavot writes in Shaar HaBitachon, Perek Dalet, that a person must believe that his efforts in earning a parnassah do not in any way enable him to earn even one more penny than Hashem already decreed for him to have. He is only making the effort because that is what Hashem wants, and once he makes a reasonable effort, he has fulfilled that obligation. Therefore, if a person is earning a lot of money through the means that he chose to put his efforts in, it is not proper for him to think that it is the business that is bringing him success. Accordingly, it is incorrect for him to add more effort and more hours simply because he is seeing success in his business. For example, if a person is working a regular eight-hour day and earning a good livelihood, he should not say, "I will add a couple of more hours to my workday so I could earn even more money." That would be an act that shows he believes it is the means that are giving him success and not Hashem. If he already created a pipeline for Hashem to send the parnassah, he does not need to add more time to his regular workday to earn more. If Hashem decreed that he should earn more, He will send it through his existing efforts or from some other channel. And even if the person does put in more effort and sees that he is earning more money from it, that would not disprove anything the Chovot HaLevavot is teaching us. Hashem runs the world in a natural way, and if it makes sense naturally that working extra hours will produce more money, Hashem is not going to stop that. However, the person will still not earn even one more penny than Hashem already decreed for him. He may be taking the money earlier than it was supposed to come, or if it is not meant for him, he will lose it in some other way. A person can never gain by doing something that Hashem does not want him to do. I once heard a question. The Midrash says that when the Jewish people conquered and settled the land, they found all of the hidden treasures of the Emorim in the walls of the homes. How did they find them? If someone had tzaraat on his house, he would have to demolish the house, and then he would find the treasures. The question is: usually tzaraat comes from sin. Does that mean that a person profits by sinning? The answer is that Hashem decreed that those treasures were going to be given to His nation. If people had not sinned, they would have received those treasures in a much nicer way. For example, by simply banging a picture frame into the wall and discovering the jewels behind it. But if someone sinned and his house contracted tzaraat, he would only find the jewels after having to demolish his entire home. That is not a gain. Similarly, says the Chovot HaLevavot, if someone earns more money by doing something wrong, he must know that if it was meant for him, he would have received it in a much nicer way, with blessing attached to it, and his efforts would have brought him benefit in this world and the next. But now, by doing something wrong, he only lost out. He would have received that money anyway, but instead, he committed an aveirah, which will be negative for him. If a person wants to increase his parnassah, it will not come through extra effort beyond what is necessary. Rather, it can come through bitachon—by understanding that Hashem is the One providing. The bitachon that a person has is a tremendous zechut, which can bring him more blessing. We must never be fooled by the way things appear in the natural world. It may look like extra hours bring more money. It may look like doing something wrong brings more profit. But that is part of the test. Emunah means to see beyond what appears to be and to believe that Hashem is running the world. And when we follow His system, that is where all the blessing lies.