Final answer:
A quote from 'Nights' by Ellie Weisler that shows allusion is the cry for 'light', referencing enlightenment and potentially alluding to Helen Keller's association of literacy with light and love.
Step-by-step explanation:
In Nights by Ellie Weisler, a quote that shows allusion is: "Light! give me light!" was the wordless cry of my soul, and the light of love shone on me in that very hour. Here, Weisler references a desire for enlightenment, which may allude to Helen Keller's experience equating literacy with light and then love. Such allusions in literature connect a character's experience to a broader, often universal concept, enhancing the depth and relatability of the narrative.