Everything in the world is fleeting and ultimately perishable. This is true of ideas and memories as well; they lose their strength and vitality over time. However, when it comes to lighting the Ĥanuka candles, we discover that faith in God never wanes. On the contrary, it continues to exist and even thrive, despite the hardships and surrounding darkness. The pure spirituality expressed in the Torah is eternal; therefore, it constantly increases. Other, more transient ideas, however, fade away and expire. Affectionately embracing this wondrous idea, the entire Jewish people fulfills the mitzva of lighting Ĥanuka candles in the most exemplary manner possible, mehadrin min ha-mehadrin, adding a candle each night until the final night when eight candles are lit.
It is well known that the number eight alludes to the metaphysical, the supernatural. The world was created in seven days, and there are seven days in a week, so the number eight indicates that which lies beyond nature. For example, the purpose of brit mila is to rectify and elevate nature to a higher level, and therefore it is performed on the eighth day from birth. The Torah, as well, belongs to the eighth level, as it serves to elevate nature to a divine level. This is why the Torah was given after the seven-week omer period, which represents the wholeness of nature. After the seven weeks of the omer, we rise to a level above nature – the festival of Shavu’ot, when the Torah was given. Similarly, we complete the annual Torah-reading cycle on Shemini Atzeret (the eighth day from the beginning of Sukkot), which is also called Simĥat Torah (in Israel).
Ĥanuka, too, belongs to the realm of the supernatural, as it reveals the lofty stature of the Oral Torah. Therefore, we light candles for eight nights, adding a new candle each night.