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

During civil disturbance be like an adolescent camel who has neither a back strong enough for riding nor udders for milking.

He who adopts greed as a habit devalues himself; he who discloses his hardship agrees to humiliation; and he who allows his tongue to overpower his soul debases the soul.

Miserliness is shame; cowardice is a defect; poverty disables an intelligent man from arguing his case; and a destitute person is a stranger in his home town.

Incapability is a catastrophe; endurance is bravery; abstinence is riches; self-restraint is a shield (against sin); and the best companion is submission (to Allah’s will).

Knowledge is a venerable estate; good manners are new dresses; and thinking is clear mirror.

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