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

Hadith n. 82
Amir al-mu’minin, peace be upon him, said: I impart to you five things which, if you ride your camels fast in search of them, you will find them worth it.

No one of you should repose hope save in his Lord (Allah); no one of you should fear anything save his sin; no one should feel ashamed of saying “I do not know” when he is asked a matter which he does not know; no one should feel ashamed of learning a thing that he does not know; and you should practise endurance, because endurance is for belief what the head is for the body, so that just as there is no good in a body without the head there is no good in belief without endurance.

Hadith n. 83
Amir al-mu’minin, peace be upon him, said about a man who praised him much, although he did not admire him: I am below what you express and above what you feel in your heart.

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