Musar zu Kohelet 5:9

Arrogance leads to the pursuit of wealth in order to lord over people. You already know what happened to Korah and his band because of his arrogance, for he sought to make himself great and to assume greatness that had not been given to him by Heaven, and from this he entered into controversy and from the controversy came jealousy and hatred. All of these qualities are very demeaning qualities, as shall, with God's help, be explained.

And the second [reason not to delay] is after he gathers and brings in [produce or other income], he will still long to gather. As our Rabbis, may their memory be blessed, said (Kohelet Rabbah 1:13), "A man does not depart the world with half of what he desires in his hands. If he has a hundred in his hands, he will desire to make two hundred; if his hands attained two hundred, he desires to make them four hundred." And so is it written (Ecclesiastes 5:9), "A lover of money never has his fill of money."

There is a certain type of man that is a man of wrath, that is always angry, and then there is a man who is calm and never gets angry at all, and if he does get angry it is a very little anger and occurs once in many years. And there is a man that is exceedingly proud of heart and there is another man who is exceedingly humble. And there is a man who lusts and his soul is never satisfied with following his desire, and there is another man, very pure of heart, who does not desire even the few things that the body needs. And there is a man with so many desires that his soul would not be satisfied with all the money in the world, like the matter that is spoken: "He that loveth silver shall not be satisfied with silver" (Eccl. 5:9).