This should answer your question
https://www.enotes.com/homework-help/according-bacon-what-three-main-benefits-study-464405
The authors purpose is what the author wants the reader to understand. That’s the purpose why the author wrote what he/she wrote. I hope that makes sense!!
AABCB
Hope I helped you :)
Part A:
Everything that lives ages.
Part B:
When I behold the violet past prime, And sable curls all silvered o'er with white
Hope this helps.