Fire is the consumptive element, it devours and destroys its subject, literally transforming it into ash. Gone is the former incarnation, transformed to a lighter material, able to catch flight in the wind or be absorbed into the earth. Fire facilitates radical transformation as it digests and eliminates any semblance of what existed before.
I don't think that it's clichè to say that "knowledge is power". When we are equipped and informed, we feel connected to a subject, capable of taking on challenges within the realm of that subject, and we are more likely to share with others what we've learned.