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.
Samuel JohnsonMany a man is mad in certain instances, and goes through life without having it perceived. For example, a madness has seized a person of supposing himself obliged literally to pray continually; had the madness turned the opposite way, and the person thought it a crime ever to pray, it might not improbably have continued unobserved.
Samuel Johnson