Allazeena amanoo watatmainnu quloobuhum bizikri Allahi ala bizikri Allahi tatmainnu alquloobu.
Those who believe, and whose hearts find satisfaction in the remembrance of Allah: for without doubt in the remembrance of Allah do hearts find satisfaction.
Surah Rad 28 Quran

Hazrath An-Numan ibn Bashir ^Rz. said that his father had carried him to the Messenger of Allah, ^PBUH. He said, Messenger of Allah, I testify to you that I have given an-Numan such-and-such. (It was a slave). The Prophet ^PBUH.asked, “Have you given each of your children the same”?” “No,” he replied. He ^PBUH.said, “Then testify to someone other than me.” Then the Prophet ^PBUH.asked, “Do you not want to show equal kindness to all of them?” “Indeed I do,” he replied. He ^PBUH. said, “Then do not do it.” ( Al-Bukhari )

It is narrated that Imam Mahdi.The Promised^PBUH would not eat even a morsel of food after the azan (prayer call) was heard.He would return the morsel in the hand to the plate.

Ameer Ul Mumineen Hazrat Ali -Ul-Murtuza ^Rz. is narrated to have said that- “I want to teach you five of those things which deserve your greatest anxiety to acquire them: Have hope only in Allah. Be afraid of nothing but sins. If you do not know a thing never feel ashamed to admit ignorance. If you do not know a thing never hesitate or feel ashamed to learn it. Acquire patience and endurance because their relation with true faith is that of a head to a body, a body is of no use without a head, similarly true faith can be of no use without attributes of resignation, endurance and patience.”