Metaphors aren’t just how we talk and write, they’re how we think. At some level, we actually do seem to understand temperament as a form of temperature, and we expect people’s personalities to behave accordingly. What’s more, without our body’s instinctive sense for temperature--or position, texture, size, shape, or weight--abstract concepts like kindness and power, difficulty and purpose, and intimacy and importance would simply not make any sense to us.