Al-Imam Ali (p.b.u.h), said:

Hadith n. 374

374. Another saying in the same strain runs as follows: So, among them (the Muslim community) there is he who disapproves evil with his hand, tongue and heart. This man has perfectly attained the virtuous habits. And among them there is he who disapproves evil with his tongue and heart but not with his hand. This man has attained only two virtuous habits but lacks one. And among them there is the third one who disapproves evil with his heart but not with his tongue and hand. This is the one who lacks the two better qualities out of three and holds only one. Then, among them there is also he who does not disapprove evil either with his tongue, heart or hand. He is just a dead man among the living.

All the virtuous deeds including war in the way of Allah as compared to the persuasion to good and dissuasion from evil are just like spitting in the deep ocean. The persuasion for good and dissuasion from evil do not bring death nearer nor do they lessen the livelihood. And better than all this is to utter a just expression before a tyrannical ruler.

Hadith n. 375

375. It is related from Abu Juhayfah who said: I heard Amir al-mu’minin, peace be upon him, saying:

The first fighting with which you will be overpowered is the fighting with hands, thereafter with your tongues and then with your hearts. Consequently, he who does not recognize virtue with his heart or does not disapprove evil will be turned upside down. Thus, his upside will be turned downwards and his lowside will be turned upwards.

Hadith n. 376

376. Amir al-mu’minin, peace be upon him, said: Certainly, right is weighty and wholesome while wrong is light and unwholesome.

Hadith n. 377

377. Amir al-mu’minin, peace be upon him said: Do not feel safe from the punishment of Allah even about the best man in the whole community because Allah, the Sublime, says: But no one feels secure against the plan of Allah save the people (who are the) losers. (Qur’an, 7:99). Again, do not lose hope even for the worst man of the community because Allah-, the Sublime says: Verily, despairs not of Allah’s mercy but the disbelieving people. (Qur’an, 12:87).

Hadith n. 378

378. Amir al-mu’minin, peace be upon him, said: Miserliness contains all other evil vices and is the rein with which one can be led to every evil.

Source: https://www.al-islam.org/nahjul-balagha-part-2-letters-and-sayings