English- Anaphora

What is it?  

the use of a word referring back to a word used earlier in a text or conversation, to avoid repetition, for example, the pronouns he, she, it, and they and the verb do in I like it and so do they


why is it used? what is it's an effect?

Anaphora is the repetition of a certain word or phrase at the beginning of successive lines of writing or speech. ... As a rhetorical device or a technique that an author uses to persuade, anaphora is used for the purpose of generating a particular effect in your audience

Find two example 

Example one

From the memories of the bird that chanted to me, 

From your memories sad brother, from the fitful risings and fallings I heard, From under that yellow half-moon late-risen and swollen as if with tears, From those beginning notes of yearning and love there in the mist, From the thousand responses of my heart never to cease, From the myriad thence-arous'd words, From the word stronger and more delicious than any, From such as now they start the scene revisiting,

- "Out of the Cradle Endlessly Rocking," Walt Whitman

Example Two 

Tired with all these, for restful death I cry,

As to behold desert a beggar born, And needy nothing trimm'd in jollity,And purest faith unhappily forsworn,And gilded honour shamefully misplac'd,And maiden virtue rudely strumpeted,And right perfection wrongfully disgrac'd,And strength by limping sway disabledAnd art made tongue-tied by authority,And folly - doctor-like - controlling skill,And simple truth miscall'd simplicity,And captive good attending captain ill

- "Sonnet No. 66," William Shakespeare