(Ism al A'tham). Some of the friends of Allah say that the Greatest Name is kept hidden, while others say it is 'Ya Hayy! Ya Qayyum!' (Oh, the Living! Oh, the Ever Self-Subsisting!) and others consider it to be the Name 'Allah'. The Name 'Allah' is the quintessence of prayer and the quintessence of the Qur'an and the quintessence of the entire deen of Islam. The dhikr of this Greatest Name 'Allah', is the most valuable activity to which man can apply himself. The Name takes the one who remembers to the One Who is Named.