People usually get tired of hearing “advice” very quickly. Some people even escape from hearing advice. However, “describing” something does not have the same effect on them, especially when it is describing goodness. Perhaps there is nothing that is able to bring enthusiasm, give enough motivation and increase resolve in people for them to move and do good deeds in the same way that describing goodness is able to do.
The Commander of the Faithful (as) has given an artistic description of pious people in the best, most famous sermon on ethics in Nahj al-Balāghah, the “Muttaqīn (Pious) Sermon.” No advice is given in this sermon. It is entirely a description of the virtues and beauties of pious people from the beginning to the end.