How is "Roll of Thunder" a story of education?

I think one of the themes in the story is the Logan's belief in education as the only way out of the cycle of black poverty and racial injustice. Although there are other themes that have to do with pride, heritage, family ....education seems to be the key to a better future for the Logan children and the black population as a whole. Big Ma instilled and enforced this value system in her children. It is difficult to argue that education is the only theme in the book but it certainly is the basis for blacks breaking the shackles of a history of injustice.