"A truly good book attracts very little favor to itself. It is so true that it teaches me better than to read it. I must soon lay it down and commence living on its hint. When I read an indifferent book, it seems the best thing I can do, but the inspiring volume hardly leaves me leisure to finish its latter pages. It is slipping out of my fingers while I read. It creates no atmosphere in which it may be perused, but one in which its teachings may be practiced. It confers on me such wealth that I lay it down with regret. What I began by reading I must finish by acting."

Source: Henry David Thoreau (2013). “Delphi Complete Works of Henry David Thoreau (Illustrated)”, p.2129, Delphi Classics