Here's a poem by William Cowper (1731-1800): Sonnet to William Wilberforce, Esq. Thy country, Wilberforce, with just disdain, Hears thee, by cruel men and impious, called Fanatic, for thy zeal to loose th'enthralled From exile, public sale, and slavery's chain. Friend of the poor, the wrong'd, the fetter-galled, Fear not lest labour such as thine be vain! Thou hast achiev'd a part; hast gained the ear Of Britain's senate to thy glorious cause; Hope smiles, joy springs, and tho' cold caution pause And weave delay, the better hour is near, That shall remunerate thy toils severe By peace for Afric, fenc'd with British laws. Enjoy what thou hast won, esteem and love From all the just on earth, and all the blest above! What is the form of this poem? What is the theme of the poem? What else strikes you about it?