Answer:
It shows that Truth has experiences to support her claims.
Step-by-step explanation:
In Sojourner Truth aka Isabella Baumfree's "Aint I A Woman?" speech, she narrates how she had experienced first hand the very issues of slavery and discrimination based on her race and gender too. She laments how she had never been helped "into carriages, or over mud-puddles, or gives me any best place" eve though men believe "women need to be helped into carriages, and lifted over ditches, and to have the best place everywhere".
By her claims of having "ploughed and planted, and gathered into barns, and no man could head me", she provides a perfect example of her independence amidst the need of women being assisted in their work or even given priority over men. By having her own experiences as proof to support her claims, Sojourner Truth provides an ethos of what her character's belief of what guides her life, providing her credibility over her claims.