From a letter of the Lubavitcher Rebbe
As has been often said before, all matters of Torah are an inexhaustible source of lessons and inspiration for our daily life, especially when they take the form of practical mitzvot, since the Torah and mitzvot are infinite, being derived from the Infinite. I mention this here apropos of the mitzva of the Chanuka lights, especially in relation to one particular aspect which, at first, appears quite puzzling.
I am referring to the fact that although Chanuka recalls many miracles and wonders, the main event for which Chanuka was instituted was the miracle of the cruse of oil, the one and only one that was found in the Beit Hamikdash (the Holy Temple), that was intact and undefiled by the enemy, which was then kindled and which lasted for eight days, until new, pure and holy oil could be prepared.
What is puzzling about it is that the oil was not required for human consumption, nor for the consumption of the Altar, but for fuel in the Menora to be burnt in the process of giving light. It would seem, at first glance, of no consequence, insofar as the light is concerned whether or not the oil had been touched and defiled, for, surely, the quality and intensity of the light could hardly be affected by the touch.
Yet, when the Talmud defined the essence of the Chanuka festival, the Sages declared that the crucial aspect was the miracle of the oil. Not that they belittled or ignored the great miracles on the battlefields, when G-d delivered the "mighty" and "many" into the hands of the "weak" and "few," for these miracles are also emphasized in the prayer of "V'al Hanissim." Nevertheless, it was the miracle of being able to light the Menora with pure, holy oil, without any touch of uncleanliness, which gave rise to the Festival of Lights.
The obvious lesson is that in the realm of the spirit, of Torah and mitzvot, as symbolized by the Chanuka lights, there must be absolute purity and holiness. It is not for the human mind to reason why, and what difference it makes, etc.
To carry the analogy further, it is the purpose of the central Holy Temple to illuminate and bring holiness and purity into the individual "Holy Temple"--i.e., every Jewish home and every Jewish person, which is also the obligation of every Jew toward his fellow Jew, in accordance with the mitzva of "love your fellow as yourself." But special precautions are necessary that the Holy Temple itself be illuminated with the purest, sanctified oil, so that even the High Priest, if he should happen to be impure, could not enter the Holy Temple, much less kindle the Menora.
May G-d grant you success in the spirit outlined above, truly reflecting the spirit of the Chanuka lights, lighting ever more candles and increasing their glow from day to day.
P.S. One of the essential messages of Chanuka is the need to preserve the purity of the Torah and mitzvot, especially in the education of our children, for the miracle of Chanuka occurred with the cruse of pure and undefiled oil.