I can't call someone hardworking just because they read and write. Even if they stay up all night reading, I won't call them hardworking if they don't know why they're doing it. You wouldn't call someone hardworking for staying awake all night for a romantic interest. Neither would I. If someone reads and writes for reputation, they love reputation. If they do it for money, they love money — not work. If they do it to learn, they love learning. But if they put their effort toward managing their own mind — keeping it healthy and living according to their nature — only then do I call them truly hardworking.
For this reason I cannot call the man industrious, if I hear this only, that he reads and writes; and even if a man adds that he reads all night, I cannot say so, if he knows not to what he should refer his reading. For neither do you say that a man is industrious if he keeps awake for a girl, nor do I. But if he does it (reads and writes) for reputation, I say that he is a lover of reputation. And if he does it for money, I say that he is a lover of money, not a lover of labor; and if he does it through love of learning, I say that he is a lover of learning. But if he refers his labor to his own ruling power that he may keep it in a state conformable to nature and pass his life in that state, then only do I say that he is industrious.