"On First Looking into Chapman's Homer" is a sonnet written by John Keats when he was just 20 years old. Essentially, it is a poem about poetry itself, describing a reading experience so profound that an entire world seems to come to life. 

The poem talks specifically about a translation of Homer, the Classical Greek poet, by George Chapman, an Elizabethan poet whose translations were more concerned with the reader's experience of the text than loyalty to the original form.  Read here.