How does the primary source in the beginning of chapter 13 connect with the events of the story?

Each chapter
of the book opens with a quote from a famous person of that period. Chapter 13 opens with an
excerpt from a letter from the first lady Abigail Adams to her husband the founding father John
Adams. It is as follows

I desire you would remember the
ladies and be more generous and favourable to them than your ancestors... Remember all men would
tyrants if they could... But such of you as wish to be happy willingly give up the harsh title
of Master for the more tender and endearing one of friend.

In terms of the chapter, the tyrant is Mr. Lockton. Returning to the house after his
arrest, he goes straight upstairs to his wife and beats her. Most likely because he has no other
way to express the anger and frustration he feels. The reader then sees the effect this has not
only on his wife, but everyone in the household. When Isabel goes upstairs to Mrs Lockton she
blames Isabel for her wound because she says she had slipped on candle wax that Isabel had
dripped on the floor.

This shows that the only way people living in a tyranny
feel they can regain their pride is by lording over someone else. Mr Lockton is arrested so he
beats up his wife, which in turn moves Mrs Lockton to blame Isabel. Perhaps the only reason
Isabel doesn't react in a similarly negative way is that she is already spying on the Locktons
for the rebels.

The reader can then see the positive effect men can have if
they resist their instinct of embracing tyranny when Isabel is at the pump collecting water. The
slaves there all seem to have given up "the harsh title of Master for the more tender and
endearing one of friend." First of all, she meets a kindly old man who says "I'm the
grandfather of everybody and everything" and then she has a conversation with Curzon where,
with patience and kind words, he steers her away from the idea of running away.

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