Those who remember Him and do so abundantly;
In private, public, at all times in continuance.
This is a noble station which each person is in need of; indeed it is a need which ranks above all other needs. The remembrance (dhikr) of Allah is the edifice of one's time. By it grief, anxiety and distress can be dispelled. With it joy and happiness can be obtained. It cultivates barren hearts, makes healthy hearts resplendent, and it leads to the loftiest of stations. In it are benefits and virtues that cannot be enumerated.
Allah, Exalted is He, said:
O you who believe! Remember Allah abundantly, and glorify Him morning and evening. [al-Ahzab 33:41-42]
Rasulullah Sallallahu Alayhi Wasallam advised a man who asked: “The duties of Islam are many for me, so instruct me?” He replied: "Never let your tongue cease to be moist with the remembrance of Allah” - Tirmidhi
Rasulullah Sallallahu Alayhi Wasallam [also] said: "The loners (mufarridun) lead the way” We asked: Who are the loners? He replied: "Those men and women who remember Allah abundantly.”
The dhikr of Allah is a light (nur) for the one remembering Allah, in his heart, speech, grave, and on the Day of Resurrection. And Allah's aid is sought.