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

Hadith n. 286

286. Amir al-mu’minin, peace be upon him, said: For every thing to which people say “how good!” there is an evil hidden in this world.

Hadith n. 287

287. Amir al-mu’minin, peace be upon him, was asked about Destiny, when he said: It is a dark path — do not tread upon it, it is a deep ocean – do not dive in it, and it is the secret of Allah — do not take trouble about (knowing) it.

Hadith n. 288

288. Amir al-mu’minin, peace be upon him, said: When Allah intends to humiliate a person He denies him knowledge.

Hadith n. 289

289. Amir al-mu’minin, peace be upon him, said: In the past I had a brother-in-faith 73 and he was prestigious in my view because the world was humble in his eyes, the needs of the stomach did not have sway over him, he did not long for what he did not get; if he got a thing he would not ask for more; most of his time he was silent, if he spoke he silenced the other speakers, he quenched the thirst of questioners, he was weak and feeble but at the time of fighting he was like the lion of the forest or the serpent of the valley, he would not put forth an argument unless it was decisive.

He would not reproach anyone in an excusable matter unless he had heard the excuse, he would not speak of any ailment except after its disappearance, he would say what he would do, and would not say what he would not do, even if he could be exceeded in speaking, he could not be excelled in silence; he was more eager to listen than to speak and if two things confronted him he would see which was more akin to the longing of the heart and he would oppose it.

These qualities are incumbent upon you. So, you should acquire them and excel each other in them. Even if you cannot acquire them you should know that acquiring a part is better than giving up the whole.