"What we read with inclination makes a much stronger impression. If we read without inclination, half the mind is employed in fixing the attention; so there is but one half to be employed on what we read."

Source: James Boswell, Samuel Johnson, Edmond Malone (1824). “The life of Samuel Johnson, LL. D., comprehending an account of his studies, and numerous works, in chronological order: a series of his epistolary correspondence and conversations with many eminent persons; and various original pieces of his composition, never before published; the whole exhibiting a view of literature and literary men in Great Britain, for near half a century during which he flourished”, p.37