The Sayings And Preaching of Al-Imam Ali (p.b.u.h)
307. Amir al-mu’minin, peace be upon him, said: A man can sleep on the death of his child, but cannot sleep at loss of property.
As-Sayyid ar-Radi says: It means that a man keeps patience on the death of his children but does not do so on the loss of property.
Hadith n. 308
308. Amir al-mu’minin, peace be upon him, said: Mutual affection between fathers creates a relationship between the sons. Relationship is more in need of affection than affection is of relationship.
Hadith n. 309
309. Amir al-mu’minin, peace be upon him, said: Be afraid of the ideas of believers, because Allah, the Sublime, has put truth on their tongues.
Hadith n. 310
310. Amir al-mu’minin, peace be upon him, said: The belief of a person cannot be regarded as true unless his trust in what is with Allah is more than his trust in what he himself has.
Source: https://www.al-islam.org/nahjul-balagha-part-2-letters-and-sayings