William Wordsworth
Robert Southey to John Rickman, 30 March 1804; Life and Correspondence (1849-50) 2:278.
Wordsworth will do better [than Coleridge], and leave behind him a name, unique in its way; he will rank among the very first poets, and probably possess a mass of merits superior to all, except only Shakespeare. This is doing much, yet would he be a happier man if he did more.