In Woman in the Nineteenth Century , there is a section where Fuller talks to a man who is not happy about women getting more education and opportunities in their lives. He says his wife should stay in the sphere of her sex, and if she steps beyond it, he won't be happy, and then she won't be happy. Fuller wonders how he knows what she thinks or wants,and she questions the power of a husband over his wife. These spheres which limit women's possibility and lives as human beings are not needed in Fuller's ideal future society. But, in fact, they are perpetually passing into one another.
Fluid hardens to solid, solid rushes to fluid.
When these masculine sphere and feminine sphere merge to each other, those characteristics become no longer categorized or limited, but they are now unique and free. Since Margaret Fuller could get the same education that any boy in her class could get in her childhood, in spite of being a female, her possibilities grew within her sphere, and she made unlimited potentiality a possibility for humanity in the nineteenth century. Her thoughts and acts were somewhat rebellious to the society at that time, which tried to limit human life, and thus her character and her intelligence merged together and created great works. She shows readers an example of an unlimited sphere, and they are all individually unique. Fuller's Woman in the Nineteenth Century gives the world hope for our future.