It is necessary because if you don't have a confirmed opinion with textual evidence to back it up you wont have a good argument.
Puritans as a political entity largely disappeared, but Puritan attitudes and ethics continued to exert an influence on American society. They made a virtue of qualities that made for economic success—self-reliance, frugality, industry, and energy—and through them influenced modern social and economic life.
Answer: he’s speaking in first person so we know that he is talking about his own personal life.
Explanation: the author is explaining some of his younger life. Explaining his feelings on what he’s talking about and what he had done
Answer:
i don't know because i don't study