'Among the productions of the twentieth century the Tractatus continues to stand out for its beauty and its power.' - A.J. Ayer; 'Mr Pears and Mr McGuinness have not only achieved a clear and natural English but have been meticulous in their care for accuracy.' - The Times Literary Supplement; 'Pears and McGuinness can claim our gratitude not for doing merely this (a better translation) but for doing it with such a near approach to perfection.'- Mind