Answer:
This was used to describe the education he received from Sophia Auld.
Explanation: In paragraph 4 of his narrative, Frederick Douglass uses the metaphor of "bread of knowledge" to describe the education he received from Sophia Auld, the wife of his slave owner. The metaphor compares knowledge to bread, a basic necessity of life, which sustains and nourishes us.
Douglass was denied education as a slave, so the knowledge he gained from Sophia was invaluable to him. By using the metaphor of "bread of knowledge," he emphasizes the importance of education in empowering and liberating individuals from oppression. Just as bread is essential to sustain the body, knowledge is essential to sustain the mind and soul. Douglass also implies that knowledge is something that can be shared and passed on, like bread that can be broken and shared with others.