잠언 10:8의 Musar

And among the things for which a person is obligated to remember the day of death is in order that he not waste [time] and his hands not falter from the service of God, may He be blessed; that he remove sleep from his eyes to toil in Torah [study] and to contemplate fear of God, to refine the traits of his soul [so as] to reach levels of fear and love; and to think thoughts of how to enhance and beatify the commandments such that his soul should be a charm and a treasure - like the matter that is stated (Proverbs 10:8), "He whose heart is wise accepts commandments." For he will know and remember that the days are short - as our Rabbis, may their memory be blessed, said (Avot 2:15), "The day is short, and the work is plentiful, and the laborers are indolent, and the reward is great, and the Master of the house is insistent."

ויקח משה את עצמות יוסף. Shemot Rabbah 20,19 comments here that someone with a wise heart chooses to perform מצות. The reference is to Moses who, while all of Israel was busy collecting silver and gold, busied himself with locating the remains of Joseph to keep the promise made to him on his death-bed that his bones would be taken for permanent burial in ארץ ישראל. We must all learn the lesson to fulfil a מצוה when it is at hand, and to desist from the pursuit of riches during the time it takes to perform the מצוה in question.