He emphasizes the depth of his love, suggesting that if he loved with complete intensity, it would still be less than what he could feel in just a single day. This conveys the idea that his capacity for love is vast and profound, surpassing typical limits.
The quote from Wuthering Heights highlights the intensity of passionate love, suggesting that the depth of feeling can be more powerful and meaningful in a short period than in a lifetime. It showcases the narrator's belief in the overwhelming power of love within a fleeting moment.