"Throughout the eight days of Hanukkah / These lights are sacred /
And we have no permission to make use of them / We may only look upon them..."
That's part of the liturgy traditionally recited upon kindling the Hanukkah lights. But what does it mean to "make use" of the Hanukkah lights? Why are we not permitted to make use of them? And how do we know all of this anyway?
A bit of learning for the festival of lights.