The mind is refrigerated by interruption; the thoughts are diverted from the principle subject; the reader is weary, he suspects not why; and at last throws away the book, which he has too diligently studied.
Source: Preface to Shakespeare (1765; repr. in Works of Samuel Johnson, vol. 7, ed. by Arthur Sherbo, 1968), of textual notes.
-- Samuel Johnson, (Sep 18 1709-1784), English lexicographer, critic; He was remembered for writing the first critique of Shakespeare, 1765 and Dictionary of the English Language, 1755.