"Thinking mode" vs. "accepting mode"
Reading puts us in active "thinking mode", as opposed to passive "accepting mode". It changes us from the inside. While reading, we actually collect ideas or dots and try to combine the pieces of information to extract the maximum meaning of it. In our brains the dots are replaced by neurons and the their connections—by synapses.
Reading improves the capacity for reading
Digital content won't kill books. Ever.
Digital vs. analog reading experience
We can use a marker on a real book to underline interesting content. This option may be available on a digital book too, depending on the software we use, but I doubt it to be more natural than the artist in us. In a real book we can also place a marker of where we are to come back later. This is "in-place" and therefore more intuitive. With a digital book, we have to write down the page number where we currently are and remember to keep the note ("out-of-place"), so we continue later from where we stopped.
With a normal book or a tablet device we look down while reading, and not forward as it is in the case of a normal big computer screen. This tends to reduce eyestrain, and allows us to read more faster.
Books are written to be sold
Books are written to be sold, not necessarily to teach us valuable things. Many authors were paid by the number of pages they write, not by the quality they deliver. In some cases this continues to be so. Many books stop suddenly when they reach page 200. This must be an alarm sign.
Acting on reading is valuable
Subscribe to the biggest local library
No matter where you live, chances are there is a big library around you. Subscribe to it and see what you wasn't aware of—it might be eye-opening. Nothing compares with the experience of learning something useful which gives us a unique viewpoint and transforms us as people. This way we'll actually gain access to the person we want to become.