Answer:
I think that the author included this to show how much he wanted to read and be free to do it.
Step-by-step explanation:
The last sentences where it says "Have I not as good a right to be free as you have?", "As many as I could, I converted into teachers," "..would give me that more valuable bread of knowledge" show that he wanted to learn and that he wanted to be free. He has given bread to learn how to read.