The bird sounds content but it actually wishes to escape
Explanation:
This extract is from the poem Sympathy in which the author compares the caged bird to the racist of the society. She symbolizes that the bird is content in the caged but it is tired of flapping its wing in the hope to escape from the cage. In the same way the cage is compared to the world and the people are compared to the bird.
In 1899 racism was prevalent in the society and hence people suffered lot and they were tired of struggling hard in this environment. So in this passage the bird sounded content but it actually wishes to escape the cage