Pirkei D’rebbi Eliezer tells us that before Adam's sin, his body was covered with the same material as our fingernails which acted as the ultimate protection from harm. Just as evil was external to man at that time, so too was he physically protected from all external negative forces. However, after the sin, Adam became vulnerable to evil, both spiritually and physically. The protective material was removed, remaining only on his fingers and toes as a lasting reminder of what once was—and the spiritual level we strive to return to.
At the conclusion of that first Shabbos (although Adam sinned on Friday, Hashem allowed him to remain in Gan Eden until after Shabbos), darkness descended for the first time. Adam was frightened, suddenly grasping the gravity of his transgression and its consequences. Darkness and evil were now mixed in and a part of his world.
At that time, Hashem provided Adam two flints, with which he created fire. Upon doing so, Adam recited the bracha of borei me’orei ha’eish. This was the first fire, and its creation marked a pivotal moment in humanity's adaptation to a post-sin reality. The fire of havdala and its bracha are reminiscent of Adam at creation.
Each Motzaei Shabbos, as we recite this same bracha during Havdalah, we gaze at the light reflected off our fingernails. This gesture recalls Adam before the sin—when his entire body shone with that protective brilliance—and the ideal we yearn to return to. As we distinguish between the kodesh and chol, sacred and the mundane, kodesh and chol, we express our longing to return to the state of yom shekulo Shabbos.
