It is easy to say that reading more is good. We all seem to agree it's better to read more. And many find that e-books help with reading, because they make it convenient and enjoyable.
But does it also matter what we read? Mark Twain said, "The man who does not read good books has no advantage over the man who cannot read them."
Clearly, there are multiple ways for books to be good for us. They may profit us because we learn. Because they make us think about the world, our life, and the people we relate to. We read in books of people who we desire to emulate in ways. Some books are profitable because they are an escape and a chance to refresh ourselves and reset ourselves in a demanding world. (If we do that with TV, for example, we may feel all the more like we wasted our time or that we are more tired than when we started.)
But I think that it's true. I'm better off for reading some books, but could be all the worse after reading others. Think about the books you read. Are they harmless fun, clearly profitable, or are they potentially even not good for you? I tend to think that we say reading is always good simply because we all have different opinions of which books are good for you and which are not, and because we optimistically assume that we only read the books that are good for us, whether to make us a better person or just to provide entertainment.
So that's the question of the day - Why do you choose the books you read, and are they "good for you"?