Books on Books #4, Order of the Universe #18

The directions in which the tragedy of this planet has trained our human feelings to play, and the combinations into which the poetry of this planet has thrown our human passions of love and hatred, of admiration and contempt, exercise a power for bad or good over human life that cannot be contemplated, when stretching through many generations, without a sentiment allied to awe. And of this let every one be assured—that he owes to the impassioned books which he has read many a thousand more of emotions than he can consciously trace back to them. Dim by their origination, these emotions yet arise in him, and mould him through life, like forgotten incidents of his childhood.

Thomas de Quincey, "The Literature of Knowledge and the Literature of Power" (1848)