Question

comparing eighteenth-century texts on slavery
however, it cannot but be very discouraging to a man of my complexion in such an attempt as this, to meet with the evil aspersions of some men, who say, that an african is not entitled to any competent degree of knowledge, or capable of imbibing any sentiments of probity; and that nature designed him for some inferior link in the chain, fitted only to be a slave. but when i meet with those who make no scruple to deal with the human species, as with the beasts of the earth, i must think them not only brutish, but wicked and base, and that their aspersions are insidious and false. and if such men can boast of greater degrees of knowledge, than any african is entitled to, i shall let them enjoy all the advantages of it unenvied, as i fear it consists only in a greater share of infidelity, and that of a blacker kind than only skin deep. and if their complexion be not what i may suppose, it is at least the nearest in resemblance to an infernal hue. a good man will neither speak nor do as a bad man will; but if a man is bad it makes no difference whether he be a black or a white devil.
according to equiano, where does he get his ideas about slavery from?
he gets his ideas from his formal education
he gets his ideas from other formerly enslaved people.
he gets his ideas from the christian bible.
he gets his ideas from his family and friends

Explanation:

Olaudah Equiano (the author in context of 18th - century slavery texts) drew on Christian teachings and the Bible to form his views on slavery, emphasizing moral and religious - based arguments against the dehumanization of enslaved people, which aligns with the option about the Christian Bible. The other options (formal education, other formerly enslaved people, family and friends) are less central to his documented ideological foundations regarding slavery.

Answer:

He gets his ideas from the Christian Bible.