The author is expressing a deep sense of identity and pride in their heritage, particularly their lineage of strong and powerful women. The use of the phrase "strong, powerful black beauty" not only conveys a strong sense of self-empowerment and confidence, but also highlights the importance of embracing one's racial and cultural identity. By invoking their mother and grandmother, the author is connecting their own strength and beauty to the legacy of these women, emphasizing the intergenerational significance of their identity. This line is powerful because it celebrates resilience, cultural heritage, and the positive impact of the author's maternal lineage.