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

Hadith n. 122
Amir al-mu’minin, peace be upon him, was accompanying a funeral when he heard someone laugh. Then he said: Is it that death has been ordained only for others? Is it that right is obligatory only on others? Is it that those whom we see departing on their journey of death will come back to us? We lay them down in their graves and then enjoy their estate (as if we will live for good after them). We have ignored every preacher, man or woman, and have exposed ourselves to every catastrophe.

Hadith n. 123
Amir al-mu’minin, peace be upon him, said: Blessed be lie who humbles himself, whose livelihood is pure, whose heart is chaste, whose habits are virtuous, who spends his savings (in the name of Allah), who prevents his tongue from speaking nonsense, who keeps people safe from evil, who is pleased with the (Prophet’s) sunnah, and who is unconnected with innovation (in religion).

Hadith n. 124
Amir al-mu’minin, peace be upon him, said: The jealousy of a woman (with co-wives) is heresy, while the jealousy of a man is a part of belief.

Hadith n. 125
Amir al-mu’minin, peace be upon him, said: I am defining Islam as no one has defined before me: Islam is submission, submission is conviction, conviction is affirmation, affirmation is acknowledgement, acknowledgement is discharge (of obligations), and discharge of obligations is action.

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