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

Hadith n. 47
47. Amir al-mu’minin, peace be upon him, said: The worth of a man is according to his courage, his truthfulness is according to his balance of temper, his valour is according to his self-respect and his chasteness is according to his sense of shame.

Hadith n. 48
48. Amir al-mu’minin, peace be upon him, said: Victory is by determination; determination is by the turning over of thoughts; and thoughts are formed by guarding secrets.

Hadith n. 49
49. Amir al-mu’minin, peace be upon him, said: Fear the attack of a noble person when he is hungry, and that of an ignoble person when he is satiated.

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