The voice of reason is built on top of the voice of power, as an enhancement more than anything else. Once it is established in a position of power, the voice of reason can then establish a higher authority (for example, a religious or legal system) to maintain that power without having to pay the more expensive costs of constant battling that the voice of power must do. The higher authority of reason does two things at once: it keeps the group together, because the group is what protects it from outside threats, and it resolves disputes internally in a way that doesn’t harm the group.
