The past treatment of Africans must naturally fill them with abhorrence of Christians; lead them to think our religion would make them more inhuman savages, if they embraced it; thus the gain of that trade has been pursued in opposition to the Redeemer's cause, and the happiness of men: Are we not, therefore, bound in duty to him and to them to repair these injuries, as far as possible, by taking some proper measures to instruct, not only the slaves here, but the Africans in their own countries? Primitive Christians laboured always to spread their Divine Religion; and this is equally our duty while there is an Heathen nation: But what singular obligations are we under to these injured people!

African Slavery in America (March 1775)