What belief does cugoano explicitly express in this excerpt?

Belief that Cugoano expresses in the excerpt is that slavery is an awful and vicious practice.

Explanation:

By 1787, Ottobah Cugoano, who has become a devout Christian by now, wrote an article titled "Thoughts and Sentiments on the Evil and Wicked Traffic of the Slavery and Commerce of the Human Species." He wrote this article to call for the abolition and liberation of slaves. This article was also sent to King George III, the Prince of Wales and Edmund Burke. But King was in opposition to the abolition of the slave trade.