Read the excerpt from letters of the late ignatius sancho, an african.

that subject, handled in your striking manner, would ease the yoke (perhaps) of many—but if only of one—gracious god! —what a feast to a benevolent heart! —and, sure i am, you are an epicurean in acts of charity.—you, who are universally read, and as universally admired—you could not fail—dear sir, think in me you behold the uplifted hands of thousands of my brother moors.—grief (you pathetically observe) is eloquent; —figure to yourself their attitudes; —hear their supplicating addresses! —alas! —you cannot refuse.
what is sancho’s purpose for writing?

to convince sterne that africans can be religious and spiritual
to convince sterne that he is a formerly enslaved person from the colonies
to convince sterne to write more texts against slavery
to convince sterne to create more characters like uncle toby