E-readers might be convenient, but they have a critical flaw: they are designed to convince you to buy more books. This is fine, it’s not that we should expect anything else; still, in the age of the attention economy, I think there’s nothing more invasive while reading a book than being sold something. Hit up the library for some good old fashioned paper books.
I believe there is value invisible value in having books in your home. Once you’ve read a book, even the cover can remind you of its lessons.
P.S. I don’t hate the Kindle—I actually find it really convenient for traveling. But I do think there’s something to be said about reading a real paper book.