Chasidut zu Mischlej 18:9

Any work is measured by the value of what it can acquire. Cheap and silly things can be acquired with almost no work. Things more expensive than that are acquired with more work. So one can only acquire Torah and be in His holy shade with hard work; but not with work that is too hard or too much for man's capabilities. For God, may He be blessed, did not give us work that is beyond our strength and our abilities. Yet we must redouble our efforts and exert ourselves in it - not to just work in it when it comes to us; but rather to be a worker in one's essence, and not be lax. And King Solomon said (Proverbs 18:9), "Even one who is lax in his work is a brother to him who destroys." The lazy one does not want to work at all, so he is one who destroys. While the lax one does work when something that must be done comes to his attention, he, himself, is not a true worker. He falls asleep on the job and takes his time for no reason. He wants to do a superficial job and does not exert himself or invest himself in it. But the industrious person is himself a true worker. He seeks to work because it is impossible for him to walk around idly. And when he has no control over it and a few hours - and all the more so, a whole day - go by without work, he is disgusted with himself and sees himself as contaminated. Work is his life and his pleasure. He is not satisfied with easy work, nor will superficiality soothe his work-hungry spirit. He works with alacrity and happily invests of himself. He is like a stream of water that builds up when impeded and gains strength when stopped, in order to break through and surge. [The true worker] too becomes more resolved with each impediment; and each delay only furthers his anticipation to surge and work more.