Answer:
This poem is called "A Dream Deferred" by some publishers, a title I think is better is described below in detail.
Explanation:
A Dream Deferred is an example of several poems Hughes formulated that relate to the experiences of African American personalities in the United States. The compact poem pretends problems about the purposes of a people and the outcomes that might appear if those dreams and wishes don't come to fulfillment. the title I think is better is A Desire Delayed.
The sentence is saying nonviolence is a powerful weapon that can destroy unrighteousness without even wounding it and can heal everything around it.
Time heals all wounds. Possible kindness is rewarded but the former makes more sense to me :)
I think it . hyperbole
I hope this help you