Truth simply is stating that she too, although a black female, is a woman. She works hard like a man and is tough like a man but she still is a woman and deserves to be treated with tenderness and consideration just as white women and women of means are.Truth, is poor and black yes, but still a woman and still worthy of being treated as such.
The thesis of Sojourner Truth's "Ain't I a Woman" speech is encapuslated in the title of the speech. Throughout the speech, Truth uses metaphors and analogies to compare her situation as a black woman to the lives of white women and people in general. She draws parallels between common human experience to make her audience see that she as a black woman is no different from anyone else. She argues that because she--and other black women--suffers just like any other human being, she should be afforded rights just like others in the country. So the thesis of Truth's speech is that black women should be afforded the same rights as others.