The final stanza adequately represents the theme of "Yo Soy Joaquin", which is cultural identity.  Joaquin represents his people and rejects assimilation into American society at large. Joaquin's pledge of endurance demonstrates his resolve to uphold his cultural identity in the face of any difficulties. 

Janie's self-reflection and searching beneath the veneer she had erected and maintained for so many years that has unearthed (recall she viewed herself as earth that absorbed urine and perfume with equal heedlessness) a precious commodity.