This phrase “There is no god but Allah“ conveys the following good news to the human spirit, suffering as it does countless needs and the attacks of innumerable enemies.
On the one hand the spirit finds a place of recourse, a source of help, through which is opened to it the door of a treasury of mercy that will guarantee all its needs.
While on the other it finds a support and source of strength, for the phrase makes known its Creator and True Object of Worship, who possesses the absolute power to secure it from the evil of all its enemies; it shows its master, and who it is that owns it. Through pointing this out, the phrase saves the heart from utter desolation and the spirit from aching sorrow; it ensures an eternal joy, a perpetual happiness.
Source: 20th Letters, Risale-i Nur Collection