Question

The greeks believed in finding the proper balance between logos and pathos, this doctrine was called the doctrine of

Answer 1

It is the Doctrine of Ethos, which is primarily applies to musical theory. The ancient Greeks held a belief that certain modes affect the balance between Logos and Pathos.

Answer 2

The greeks believed in finding the proper balance between logos and pathos, this doctrine was called the doctrine of Ethos. Logos refers to rational behaviour, while pathos refers to the emotional behaviour. Only  the balance of both behaviours had the power of affecting humans positevely.