Musar for Eruvin 162:15

And were it possible to conquer one's impulse by force and that money should be seen in one's eyes as nothing in comparison to doing the Creator's will! Therefore, one should look at money as stones to do our Heavenly Parent's will. And should should believe with perfect faith, and set it in one's heart with immovable nails that the amount of one's food is defined by Heaven. Even if they went to heaven or went down to the deepest depths, no one could add or subtract even a cent [to this quantity] with the exception of the outlays of mitzvot and good deeds which are not defined, rather on this case if a person adds, they add to that person. And therefore one who acquires their world through their money by doing lots of tzedakah, mitzvot and good deeds, and acquires a good name for themselves, and acquires words of Torah, and acquires for oneself life of the world to come. And the mnemonic: 'word of Torah, coins acquired' (Eruvin 81b, Bava Kamma 46b, Bava Kamma 47b and other places) that for all words of Torah and for all good things one needs coins, and money will answer all. One who is wise will guard these words and won't go to sleep. End of all words, all was heard, fear God and guard God's mitzvot, since this is all that there is to being human (Eccl. 12:13)