Work and Pleasure

To be really [blank] and really safe, one ought to have at least two or three hobbies, and they must all be real. It is no use starting late in life to say: "I will take an interest in this or that." Such an attempt only [blank] the strain of mental effort. A man may acquire great knowledge of topics unconnected [blank] his daily work, and yet hardly get any benefit or relief. It is no use doing what you like; you have got to like what you do. Brodly speaking, human beings may be divided [blank] three classes: those who are toiled to death, those who are worried to death, and those who are bored to death.