Answer:
In William Shakespeare's "Sonnet 29," the speaker's tone changes over the course of the poem from one of despair and self-pity to one of hope and redemption.
The tone change occurs in the final couplet of the poem, where the speaker reflects on the power of the poem itself to lift him from his despondency and to bring him solace.
Previously, the speaker expresses feelings of self-pity and despair, lamenting his "outcast state" and his "bare ruined choirs," which he compares to the "bare ruined choirs" of a church. He also speaks of being "forlorn" and of "black despair."
However, in the final couplet, the tone shifts to one of hope and redemption, as the speaker reflects on the power of his own poetry to lift him from his despair and to bring him solace. He declares that "yet in these thoughts myself almost despising, / Haply I think on thee - and then my state, / Like to the lark at break of day arising / From sullen earth, sings hymns at heaven's gate."
In this final stanza the speaker realizes that love, in this case for a person, can change his mood and his state of mind, giving him hope and redemption.
Step-by-step explanation: