Fire in a dream can point in two directions at once -- passion and vitality on one hand, destruction and loss of control on the other, and the tone of the dream usually tells you which. A fire you're tending deliberately often reflects transformation you're choosing, while one raging out of control may name a change that feels like it's happening to you.
The Sun is in conflict with those who are ruled by Saturn, and Saturn is in conflict with those ruled by the Sun. - Picatrix (Andalusia, ~1000.AD)