Musar su Ecclesiaste 9:10

There would be no room for this incitement if they saw the truth of the matter, but since they do not seek the truth, but go on in their erroneous ways willingly, this incitement will not leave them until the time when it will no longer avail. For it will not be in their power to rectify what they had ruined. This is what King Shlomo, peace be unto him, referred to: "Whatever your hand finds to do with your power, do it, for there is no deed, nor account, nor knowledge, nor wisdom [in the She'ol (grave) where you are going]" (Ecc.9:10).

The explanation is that: what a man can do while the power is granted in his hands by the Creator, namely, the power of free will granted to him all the days of his life with which he chooses and is commanded to do, behold he will not be able to do more in the grave and pit. For this power [of free will] will no longer be in his hands. Thus one who has failed to do many good deeds in his lifetime, it is impossible for him to do them afterwards (since he no longer has free will after death). And he who did not make an accounting of his deeds [while alive] will no longer have the opportunity to do it then. And he who has not become wise in this world, will not become wise in the grave. This is the intent of: "for there is no deed nor account nor knowledge in the She'ol were you are going" (Ecc.9:10).

Occupying oneself to obtain a livelihood is indeed necessary but it is not necessary to occupy oneself to such an extent that he has no room left for service [of G-d]. For this we were commanded to fix times for Torah study.