To be really happy 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 aggravates the strain of mental effort. A man may acquire great knowledge of topics unconnected with 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. Broadly speaking, human being may be divided into three classes: those who are toiled to death, those who are worried to death, and those who are bored to death. It is no use offering the manual laborer, tired out with a hard week's sweat and effort, the chance of playing a game of football or baseball on Saturday afternoon. It is no use inviting the politician or the professional or businessman, who has been working or worrying about serious things for six days, to work or worry about trifling things at the weekend.