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

Hadith n. 462

462. Amir al-mu’minin, peace be upon him, said: Many a man gets into mischief because of being spoken well about.

Hadith n. 463

463. Amir al-mu’minin, peace be upon him, said: This world has been created for other than itself and has not been created for itself.

Hadith n. 464

464. Amir al-mu’minin, peace be upon him, said: The Banu Umayyah (Umayyids) have a fixed period (mirwad) wherein they are having their way. But when differences arise among them then even if the hyena attacks them it will overpower them.

As-Sayyid ar-Radi says: Herein ‘‘mirward’’ is a form derived from ‘‘irwad’’ which means to allow time, to wait for. It is an extremely eloquent and wonderful expression. It is as though Amir al-mu’minin, peace be upon him, has likened the period of Banu Umayyah to a limited area meant for the training of horses for racing where they are running towards the limit, so that when they reach its extremity their organization will be destroyed. 97

Hadith n. 465

465. Amir al-mu’minin, peace be upon him, said eulogizing the Ansar : By Allah, they nurtured Islam with their generous hands and eloquent tongues as a year old calf is nurtured.

Hadith n. 466

466. Amir al-mu’minin, peace be upon him, said: The eye is the strap of the rear.

as-Sayyid ar-Radi says: This is a wonderful metaphor, it is as though Amir al-mu’minin has likened the rear part of the body with a bag and the eye with a strap. When the strap is let loose the bag cannot retain anything. According to the well-known and reputed view it is the saying of the Prophet but some people have stated it to be of Amir al-mu’minin. Al-Mubarrad has mentioned it in his book al-Muqtadab under the chapter ‘Words of single letters’. We too have discussed this metaphor in our book named Majazat al-athar an-nabawiyyah.

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