Abu Muslim Al-Khawlaanee (rahimahullaah) used to remember (Allaah) much; so some people saw him and disapproved of his state of affairs and said to his companions:”Is your companion insane?” So Abu Muslim heard (this) and said: ”No, O brother, this(i.e. remembrance of Allaah) is a remedy for insanity.” [Jaami-ul Uloom Wal-Hikam: page:465]