Charles Wesley was a poet and wrote more than 6,500 poems that became hymns beginning in the Eighteenth Century. Wesley was a master at using words to describe his own spiritual experiences. His use of oxymorons is very effective in this stanza of O For a Thousand Tongues to Sing.
Hear him, ye deaf; his praise, ye dumb, Your loosened tongues employ;
Ye blind, behold your Savior come; And leap, ye lame, for joy.
A deaf person cannot hear him. A mute person cannot praise. A blind person cannot see the Savior. Someone that is lame cannot leap for joy. Wesley is saying when Jesus speaks new life breaks forth to those who believe. In Christ, the deaf hear, the mute praises, the blind see, and the lame leap! Jesus makes all things new.