I think people change when they feel different from others like they are not part of the group
Established facts analysis
The excerpt given above is taken from Phillis Wheatley's poem "On Being Brought from Africa to America". The word sable literally means color black. In this line, Wheatley uses the word "sable" to indicate sense of inferiority. The author is an African and their race color is different from the rest.
(sorry if im wrong)
