Al-Imam Ali (p.b.u.h), said:
Hadith n. 366
366. Amir al-mu’minin, peace be upon him, said: Knowledge is associated with action. Therefore, he who knows should act, because knowledge calls for action; if there is a response well and good, otherwise it (i.e., knowledge) departs from him.
366. وقال عليه السلام : الْعِلْمُ مَقْرُونٌ بِالْعَمَلِ فَمَنْ عَلِمَ عَمِلَ، وَالْعِلْمُ يَهْتِفُ بِالْعَمَلِ فَإِنْ أَجَابَهُ وَإِلاَّ ارْتَحَلَ.
Hadith n. 367
367. Amir al-mu’minin, peace be upon him, said: O people, the wealth of this world is broken orts that brings an epidemic; therefore keep off this grazing land, leaving it is a greater favour than peacefully staying in it, and its part enough for subsistence is more blissful than its riches. Destitution has been ordained for those who are rich here, while comfort has been destined for those who keep away from it. If a person is attracted by its dazzle, it blinds both his eyes; and if a person acquires eagerness towards it, then it fills his heart with griefs which keep alternating in the black part of his heart, some grief worrying him and another giving him pain. This goes on till the suffocation of death overtakes him. He is flung onto the open ground while both his arteries are severed. It is easy for Allah to cause him to die and for his comrades to put him in the grave.
The believer sees the world with eyes that derive instruction, and takes from it food enough for his barest needs. He hears in it with ears of hatred and enmity. If it is said (about someone) that he has become rich, it is also said that he has turned destitute; and if pleasure is felt on one’s living, grief is felt over his death. This is the position, although the day has not yet approached when they will be disheartened.
368. Amir al-mu’minin, peace be upon him, said: Allah, the Glorified, has laid down reward for obedience to Him and punishment for committing sins against Him in order to save men from His chastisement and to drive them towards Paradise.
Hadith n. 369
369. Amir al-mu’minin, peace be upon him, said: A time will come when nothing will remain of the Qur’an except its writing, and nothing of Islam except its name. The mosques in those days will be busy with regards to construction but desolate with regard to guidance. Those staying in them and those visiting them will be the worst of all on earth. From them mischief will spring up and towards them all wrong will turn. If anyone isolates himself from it (mischief) they will fling him back to it and if anyone steps back from it they will push him towards it. Says Allah, the Glorified, (in hadith qudsi — i.e., the tradition in which Allah- Himself speaks): I swear by Myself that I shall send upon them an evil wherein the endurer would be bewildered, and He would do so. We seek Allah’s pardon from stumbling through neglect.
Source: https://www.al-islam.org/nahjul-balagha-part-2-letters-and-sayings