The question asks for instances from a poem, but the source passages provided are all from Nelson Mandela's prose piece "Long Walk to Freedom" (Chapter 2), not a poem. There is no poem or poetic text in the passages given.
The source passages provided do not contain a poem. The passages are from Nelson Mandela's "Long Walk to Freedom." Therefore, this question cannot be answered from the given material.
(If this question refers to a poem from a different chapter — such as "A Tiger in the Zoo" or another prescribed poem — please share the relevant passage so the question can be answered accurately.)