Little of the light repels much of the darkness
A little of the light repels much of the darkness...
Threre are several Talmudic enlightening expressions on 'light' had. Among them, is the follwoing: A candle for one, a candle for a hundred (Tractate Shabbat), is a Talmudic expression that means that there are actions in which the same benefit that accrues to an individual can also benefit many. The expression deals with the light of a candle that can benefit a hundred people as much as it benefits a single person.
Midrash in Lamentations says God said, that the light of the Torah would bring them to better their ways (returning, repentance). Inspired, elaborated Rabbi Bahya (circa 1021): "because a little truth defeats much falsehood, just as a little light dispels mucexpressions.
Though, the exact phrase is his, it is derived from various Talmudic expressions.
Now, since Chanukkah is about light. The victory (over those attempting to root out the Torah and had contaminated the Temple, had introduced idols and forbade some basic laws), was about spiritual strength, maintaining, and the power of faith in God and his miracles, not just the victory of 'the few against the many,' but the miracke of oil in the sanctity of the Temple, this phrase has been used with Chanukkah.