والغرض من هذه الصناعة أن ينفعل النفس بالترهيب والترغيب
The purpose of this art is for the soul to be affected by warning and encouragement.
Targhīb presents a matter attractively so the audience desires it. Tarhīb presents the harm or ugliness of something so the audience wishes to avoid it.
For example, images of the benefits of fairness can encourage justice; images of oppression’s effects can inspire revulsion. The immediate aim is motivational, whereas establishing conclusive truth belongs to demonstration.