The power of reading a great book is that you start thinking like the author. For those magical moments while you are immersed in the forests of Arden, you are William Shakespeare; while you are shipwrecked on Treasure Island, you are Robert Louis Stevenson; while you are communing with nature at Walden, you are Henry David Thoreau. You start to think like they think, feel like they feel, and use imagination as they would. Their references become your own, and you carry these with you long after you've turned the last page.
Tony Robbins