It sounds like Fredrick Douglass was pointing out that slave masters didn't want their slaves to have knowledge such as reading and writing, let alone knowing their own ages and such.
Most slave masters wanted this so that they could feel superior over blacks, and they didn't want the slaves to be equal with them.
Answer:
who actively opposes or is hostile to someone or something.
Explanation:
The gulls are tossed paper in a storm, flashes of white in the grey, tumbling as they struggle against the gale. Beneath them the sea rises as great mountains, anger in the form of water, turbulent and unforgiving.