Virtues to remember Allah in ones heart are 70 times
Great hadith master, Hadhrat Mulla Ali Qari quds sarrahu has quoted hadith in this compiled book of Prophet’s sayings, “Mirqat al-Mafatih commentary on Mishkat ul Masabeeh”, narrated by Hazrat Ayesha, mother of believers (May Allah be Pleased with her) :
Hazrat Ayesha, mother of believers (may Allah be pleased with her) narrates that Messenger of Allah (may peace be upon him) said the zikr (remembering Allah) which cannot be known to the Kiram an-Katibin, is seventy times superior to other types of zikr that they can listen i.e. verbal remembrance. On the Day of Judgment, mankind will be called to reckoning by Him and the Kiram an-Katibin directed to produce the Register of Conduct of every person. Angels will present everything that they remembered or have written. These Angels will be commanded to re-examine the records to see if any of their deeds remained unrecorded. They would submit that everything what we know or remembered had been duly put down. On this Allah Almighty Shall then inform the person that I have one good deed that these angels do not recognize and I Will Give you reward for this and this good deed is the secret (hidden or veiled) remembrance (zikr-e-khaffi).
Mirqat al-Mafatih – Volume 1, Page 342