The meaning is that the oppressed know and understand what their experiences are. Oppressors can’t understand or determine the truth of the oppressed because they have no understanding of how the oppressed feel. The oppressed also see the truth in the behavior for the oppressors. For example, black people know the truth of their oppression because we specifically have the experience.
The person who said this is A. St George.
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He was talking to a woman in the book St. George and the Dragon.
I'd love to help you out but i'm not gonna write the whole review paper for you.
Medusa because it would turn him to stone'