Remembrance is the Greatest Act

"Therefore remember Me, I will remember you, and be thankful to Me, and do not be ungrateful to Me."

Certainly Allah's Remembrance is the Greatest Act

[4.Surah An-Nisaa : Ayah 103] "Then when you have finished the prayer, remember Allah standing and sitting and reclining; but when you are secure (from danger) keep up prayer." [7.Surah Al-Araf : Ayah 205] "And remember your Lord within yourself humbly and fearing and in a voice not loud in the morning and the evening and be not of the heedless ones." [8.Surah Al-Anfal : Ayah 45] "O you who believe! when you meet a party, then be firm, and remember Allah much, that you may be successful." [13.Surah Ar-Ra'd : Ayah 27-28] "Surely Allah makes him who will go astray, and guides to Himself those who turn (to Him). Those who believe and whose hearts are set at rest by the remembrance of Allah; now surely by Allah's remembrance are the hearts set at rest." [20. Surah Taha : Ayah 14] "Surely I am Allah, there is no god but 1, therefore serve Me and keep up prayer for My remembrance." [29. Surah Al-Ankabut : Ayah 45]"Certainly the remembrance of Allah is the greatest, and Allah knows what you do." [33. Surah Al-Ahzab : Ayah 35,41-42] "And the men who remember Allah much and the women who remember-- Allah has prepared for them forgiveness and a mighty reward." "O you who believe! remember Allah, remembering frequently, And glorify Him morning and evening." [62. Surah Al-Jumah : Ayah 10] "Remember Allah much, that you may be successful." [63. Surah Al-Munafiqun : Ayah 9] "O you who believe! let not your wealth, or your children, divert you from the remembrance of Allah; and whoever does that, these are the losers." [73. Surah Al-Muzzammil : Ayah 8] "And remember the name of your Lord and devote yourself to Him with (exclusive) devotion." [74. Surah Al-Muddathhir : Ayah 3] "And your Lord do magnify." [76. Surah Al-Insan : Ayah 25-26] "And glorify the name of your Lord morning and evening. And during part of the night adore Him, and give glory to Him (a) long (part of the) night." [94. Surah Al-Sharh : Ayah 7-8] "So when you are free, nominate. And make your Lord your exclusive object." [110. Surah Al-Nasr : Ayah 3] "Then celebrate the praise of your Lord, and ask His forgiveness; surely He is oft-returning (to mercy)." [Sahih Hadith: Volume 8, Book 75, Number 416] Narrated 'Abu Musa (Radi Allah Anhu) : The Prophet Muhammad (sal-allahu-alleihi-wasallam) said, "The example of the one who remembers (glorifies the Praises of his Lord) Allah in comparison to the one who does not remember (glorifies the Praises of his Lord) Allah, is that of a Living creature to a Dead one."