Wealth would cause a Talmid Chocham to sin

 Tanna DeBei Eliyahu Rabbah (03:01) Any Torah scholar who spends much time in the business of the Torah and does not make much of a living, it  is a good sign for him. And if you ask if God loves his Torah why does he not make him wealthy? Because if he gets rich he will transgress the words of the Torah.