It is therefore manifest, that something else ought yet to
be done; and what is required, is evidently the incumbent
duty of all men of enlightened understanding, and of
every man that has any claim or affinity to the name of
Christian, that the base treatment which the African
Slaves undergo, ought to be abolished...
- Thoughts and Sentiments on the Evil and
Wicked Traffic of the Slavery and Commerce of
the Human Species,
Quobna Ottobah Cugoano

What belief does Cugoano explicitly state in this
passage?

People who enslave others are immoral.

Education will turn people against slavery.

Slavery should be abolished.

It can be difficult to do one's duty.