We all shudder at the thought of murdering another human being. Neither do we want to inflict physical injury to others. In day to day life of an ordinary human being, there is equal participation of the physical body and the mind. Just like the pain elicited from a physical assault, verbal assault can also give extreme pain.
Verbal assaults are longer lasting. The intensity of a physical assault cannot be felt the same way when it is remembered at later date. But the caustic remarks, even when remembered years later, will cause the same amount of mental pain.