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

The bosom of the wise is the safe of his secrets; cheerfulness is the bond of friendship; effective forbearance is the grave of short-comings.
It is narrated that Amir al-mu’minin said in expressing this meaning that: Mutual reconciliation is the covering for shortcomings; and he who admires himself attracts many opponents against him.

Charity is an effective cure, and the actions of people in their present life will be before their eyes in the next life.

How wonderful is man that sees with fat, talks with a piece of flesh, hears with a bone and breathes through a hole.

When this world advances towards anyone (with its favours) it attributes to him other’s good; and when it turns away from him it deprives him of his own good.

Meet people in such a manner that if you die they should weep for you and if you live they should long for you.

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