Kumail bin Ziyaad (rahimahullah) reports the following:

On one occasion, Hazrat Ali (radhiyallahu ‘anhu) held my hand and came with me to the outskirts of the city. As we came to the desert, Hazrat Ali (radhiyallahu ‘anhu) sat. He then sighed deeply and said the following:

“O Kumail bin Ziyaad! The hearts of people are like vessels, and the best of hearts are the hearts that retain and remember the best. Remember what I am going to say to you!