If you remember the main ideas of a book or the justifications you can just return to the book when you need more detail than whatever you remember. If you read

If you remember the main ideas of a book or the justifications you can just return to the book when you need more detail than whatever you remember. If you read enough to realize that something is true then it's not always necessary to remember why X is true, you can just rely on your past self, who, while doing the reading, reached a conclusion on X. Also, I'm curious, what would I be able to do, think, or be after spending 100 hours studying The Republic?