Hard work is certainly the key to success and everyone in this world knows about this. Infact we are taught this since class one. But then nobody teaches us what actually success is.
Keeping in mind the above proverb the meaning of success varies with the type of hard work we are doing. Success is not only achieving your aim or reaching to the destination you always wanted to, rather it is pleasure we obtain after successful completion of a task. The task may be a recipe cooked in the kitchen or completion of a painting or portrait. It may be packing bags for an outing or successfully climbing a hilltop.
I mean to say that every time we do some work for gaining pleasure we are putting our hard work into it. So let me once refine hard work; it's nothing but the efforts put by any person for gaining pleasure in something.
Now let me come to the point provided by the author here. Yes, many people in fact all of us are every time indulged in hard work. Because we are everytime involved in making ourselves happy. Even if we are sleeping we are gaining freshness and pleasure in it which is substantially going to make us happy. Throughout the day we do so much of work so that we could get a better sleep. That's hard work.
The author has referred to a few people who are always involved in tasks, may be you are willing to say their business or occupational tasks not hard work.
Yes, there are many such people who give more time to their occupation rather than other pleasing tasks. This is so because they feel more pleasure in that. Let us take the example of Isaac Newton who had so much hunger in himself for his new theories that he even forgot that he had invited his friends for dinner and they all had to sleep empty stomach.
It happens with all those people who have craving for their work, their occupation and their tasks. Because they feel highest degree of pleasure in that.
For other humans who take their occupation just as a duty or a way to earn money might get bored by their tasks and want freedom, outing or a gap for sometime.
Let's enlighten paths with the ray of knowledge.