The Bnei Yissaschar (Rabbi Zvi Elimelech of Dinov) teaches: On Chanukah, we are given part of the or ha-ganuz, the primordial light which has been hidden-away since the moment of Creation and which is preserved for the righteous in the world to come. (This is the light of the first day of creation, before the sun and moon and stars were created; not literal light, but a kind of spiritual or metaphysical light, the light of expanded consciousness.) With this light, you could see from one end of the earth to the other. And with this light, we kindle other holy lights -- the souls within each of us.
(From his teachings on the month of Kislev; the final insight comes from Michael Strassfeld's commentary in The Jewish Holidays.)
The Sfat Emet (Rabbi Yehuda Leib Alter of Ger) teaches: "The candle of God is the soul of man, searching all of one's deepest places." (Proverbs 20:27) In the spring we search our homes for leaven with a candle. (That's the ritual of bedikat chametz, hiding some leaven around the house and then "discovering" it with a candle, to ceremonially burn it before the holday begins.) At this season, we search our innermost selves for the spark of God which illuminates us (as the Chanukah candles illuminate what's around us.)
The mishkan, the dwelling-place-for-God (e.g. the holy Temple, the one whose rededication we celebrate at this season even though it's been destroyed now for almost two thousand years) -- that holy dwelling-place is within each of us, as we read in Torah, "they shall build for Me a sanctuary and I will dwell within them." (In other words: we built the sanctuary not so that God could live in it, but so that through the process of the building we might open our hearts for God to dwell in us.)
The Temple no longer exists; in our era the mishkan is hidden -- but we can still find it by searching for it, which we do with the (metaphorical) candles of the mitzvot. We search for God's presence by "lighting the candles" of doing mitzvot. Doing mitzvot with all of our hearts, our souls, our life-force, is a way of searching for God's presence in the world. Through doing mitzvot with intention and awareness, we are able to find the point within us which is the hidden mishkan, the dwelling place for God.
(Here's a longer exploration of this teaching: Sfat Emet on light and Chanukah, 2010.)
The Sfat Emet also teaches: The miracle of Chanukah was one of light. This light allows us to find the hidden illumination / enlightenment which is in darkness and in our alienation.
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As we kindle the Chanukah lights tonight for the last time this year, may we experience their light as a glimpse of that primordial light from the first moment of creation; may we find our souls kindled through the act of doing this mitzvah, and may we recognize ourselves as dwelling-places for God's presence; and may our lights connect us with the hidden illumination which can be found in even our darkest emotional and spiritual places.