To be really 1 , one should have at least two or three 2 , and they must all be really. It is no use starting late in life to say:" I will takean 3 in this or that." Such an attempt only gives you 4 stress. A man may learn great knowledge of 5 unconnected with his daily work, and yet hardly get 6 benefit (益处) or relief (放松). It is no 7 doing what you like; you have got to 8 what you do. Generally speaking, human beings may be divided into 9 classes: those who are toiled (劳苦) to 10 , those who are 11 to death, and those who are bored to death. It is no use offering the manual (体力的) laborer the 12 of playing 13 or baseball on Saturday afternoon. It is no use inviting a business man, who has been working or 14 about serious things for six days, to work or worry about small things at the 15 .