Voice and silence
Celie starts the novel with no one to talk to except God, and even that feels unanswered. The whole novel is about what it takes for a woman with no power to find her voice. When Celie finally speaks her anger to Mister, it is because years of support from other women made it possible.
Female solidarity
Men in this novel mostly harm or abandon women. Women save each other. Shug gives Celie love and courage. Nettie keeps writing even when she gets no reply. Sofia models defiance. Walker shows solidarity as the actual engine of survival.
Race, gender, and double oppression
Celie faces racism and sexism at the same time, and the novel never lets you separate them. Sofia's imprisonment shows what happens when a Black woman resists white authority. Nettie's letters from Africa show that colonialism abroad and racism at home come from the same source.
Spirituality and self-worth
Celie's early God is distant and male and does not help her. Shug offers a different idea: God is in everything, in color, in nature, in joy. As Celie adopts this view, she stops waiting for permission to value herself.
Liberation through independence
Walker makes freedom concrete. Celie does not just feel better; she leaves, she earns money, she owns property. The novel argues that emotional growth without material change is not enough. Liberation requires actual resources and the ability to walk away.