A good book usually summarizes itself as its arguments develop. An orator’s great trick is to leave certain things unsaid that would be challenged if they were made explicit. Find what things the orator says must be assumed, what can be proved, and what need not be proved because it is self-evident.
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How to read a book,by Mortimer Adler
When you read a book, do you find yourself forgetting what you read? Do you regret wasting time on books that you should have skimmed instead?