We are nearing the end of Hanukkah. Every season in Judaism is lived according to its specific customs and laws that distinguish it from the rest. For example, Shabbat has a particular set of laws that only apply when it is the seventh day of the week. Passover has another set of laws (sometimes there are points of overlap between different seasons as well) that only apply when the 15th of Nisan arrives, and so on.
However, Hasidic teachings emphasize the idea that every time of year, with its laws and customs, actually has an effect and various lessons for daily life, even if it is not that original time. Similarly, Hanukkah contains lessons that can be applied at other times in life.
Our sages explain that Hanukkah candles should be lit "at the door of the house, on the outside." The halakhic—legal—reason for this is to publicize the miracle of Hanukkah, to make it known.
The Hasidic masters further explain that the teaching in the service of God at this place of illumination is to light up the "outside." The basic idea is that we must bring the light of Torah, kindness, holiness, and good feelings to the world at large, which is in a state of "darkness" and "outside.".
However, there is an external, personal "darkness." It's very easy to talk about and dedicate oneself to improving the world in general, since, in any case, it's something so vast and so global that it doesn't require active involvement in the work or a significant, timely effort. In other words, the effect of one person doing another a favor is (apparently) so insignificant that, after all, it's not so difficult to do in practice. Who doesn't do something good from time to time?
However, the profound message of Hanukkah doesn't limit itself to what lies outside the individual, but also addresses those qualities within the person that are external to their relationship with God—those attitudes that are obscure and inappropriate in light of the Torah. The idea of illuminating the darkness outside begins primarily with oneself, with refining one's own qualities and attitudes in the realms of thought, word, and deed.
And the way to begin is by illuminating one's own life with that powerful and sublime light that is the Torah, as the verse says, "For the Mitzvah is [like a] candle and the Torah is [like] light.".