Answer:
The phrases that show Byron's subject is rich in kindness and grace are:
And all that’s best of dark and bright
Meet in her aspect and her eyes;
Where thoughts serenely sweet express,
How pure, how dear their dwelling-place.
Step-by-step explanation:
The speaker in Lord Byron's poem "She Walks in Beauty" deeply admires his subject, an unnamed woman whose qualities are only comparable to natural beauties, such as "cloudless climes and starry skies". The speaker uses the harmony between light and darkness to express how graceful her physical appearance is:
And all that’s best of dark and bright
Meet in her aspect and her eyes;
He also admires her for her inner beauty, her kindness and pureness, as expressed in the lines:
Where thoughts serenely sweet express,
How pure, how dear their dwelling-place.
This incredible woman is, thus, the perfect combination of physical attractiveness and good personality. She is kind and graceful, so perfect that any slight change would have "half impaired" such sublimity.