Authors:

For a highly motivated learner, it's not like knowledge is secret and somehow the Internet made it not secret. It just made knowledge easy to find. If you're a motivated enough learner, books are pretty good.

"Q&A: Bill Gates On Flying Cars, The Malaria Epidemic, And Article-Writing Robots". Interview with Steven Levy, www.wired.com. April 16, 2013.
For a highly motivated learner, it's not like knowledge is secret and somehow the Internet made it not secret. It just made knowledge easy to find. If you're a motivated enough learner, books are pretty good.