"The value of a book is in its use, not its quantity"这句话的来源可以追溯到古希腊哲学家亚里士多德（Aristotle）的著作《论智慧》（Nicomachean Ethics）中。他在书中提到："We do not value a possession for its own sake, but for the sake of its use."

例句:

"The value of a book is in its use, not its quantity, and the value of a friend is in his character, not his wealth."
"It's not the number of books you own that's important, it's how you use them."
"Don't collect friends pke you collect books, the value of a friend is in their character, not the quantity you have."

中文翻译:

"一本书的价值在于它的用途，而不在于它的数量，朋友的价值在于他的性格，而不在于他的财富。"
"重要的不是你拥有的书的数量，而是你如何使用它们。"
"不要像收集书一样收集朋友，朋友的价值在于他们的性格，而不在于你拥有的数量。"