Unless we are or will one day be famous, which isn't very likely, our books are devalued when we mark in them, either by underlining passages or writing notes. The used-book trade prefers that books be kept in pristine condition. Yet those marks we make in our own books may actually increase their value to us. They can remind us, years later, what we once found important in those books. They are reminders of who we were and what we were thinking at that earlier time. We can even recall the gist of a book simply by rereading what we underlined or what we wrote in the margins.
Lately I have been doing a lot of this. Several days ago I posted some passages about children and parenting that I underlined in books read back in the 1970s and 1980s. Here are a few more underlinings from books about economics, religion, literature and other topics read during the same period:
"There are no ordinary people. You have never talked to a mere mortal." - C.S. Lewis in The Weight of Glory (1949)
"The strength of a man's virtue must not be measured by his efforts, but by his ordinary life." - Pascal's Pensees (17th century)
"Propaganda thus serves more to justify ourselves than to convince others; and the more reason we have to feel guilty, the more fervent our propaganda." - Eric Hoffer in The True Believer (1951)
"Most social revolutions promise a reign of the saints. Most promise a new type of moral man. And most intend to produce this higher type of morality through the coercive power of the state. This is precisely the impulse in the human heart which democratic capitalism finds to be the most productive of evil." - Michael Novak in The Spirit of Democratic Capitalism (1982)
"The fact that the greatest advance made in woman's progress toward political equality came hard on the heels of a devastating World War was not accidental. ... Western women, in that sense, were the real winners of the century's great world wars." - Amaury deRiencourt in Sex and Power in History (1974)