A bear in a dream often speaks to inner strength and the instinct to protect what matters, sometimes through anger that surprises even you. Bears are also solitary animals, so the dream can point to a need for retreat or quiet after being pushed too far. A calm bear may reflect strength you're finally owning; a charging one usually names a boundary that's been crossed.
Mercury conflicts with those who are ruled by Jupiter, and Jupiter conflicts with those ruled by Mercury. - Picatrix (Andalusia, ~1000.AD)