The words of tasbeeh, “Subhaan Allaah”, incorporate one of the greatest fundamental meanings of Tawheed and one of the basic principles of belief in Allaah, which is declaring Him to be above any fault, shortcoming, corrupt notions or false idea.
Saying Subhan Allah is one of the many ways by which a Muslim believer can remember Allah.
Shaykh al-Islam Ibn Taymiyah (may Allah have mercy on him) said: “The command to glorify Him (by saying Subhan Allaah) also implies declaring Him to be above every fault and shortcoming, and affirming the attributes of perfection for Him. Tasbeeh implies declaring Him to be above any fault and venerating Him, and veneration implies affirming praiseworthy attributes for which He is praised, and that implies declaring Him to be above any faults, praising Him, magnifying Him and affirming His Oneness.”
However, saying the following is even better because of the numbers:
“Subhaan Allaah wa bi hamdih, ‘adada khalqihi, wa ridaa nafsihi, wazinata ‘arshihi, wa midaada kalimaatihi”
(Glory and praise be to Allah, as much as the number of His creation, as much as pleases Him, as much as the weight of His Throne and as much as the ink of His words)
Ibn al-Qayyim (may Allah have mercy on him) said:
Saying: Subhaan Allaah wa bi hamdih, ‘adada khalqihi, wa ridaa nafsihi, wazinata ‘arshihi, wa midaada kalimaatihi (Glory and praise be to Allaah, as much as the number of His creation, as much as pleases Him, as much as the weight of His Throne and as much as the ink of His words) is many times better than merely saying Subhaan Allaah (Glory be to Allah). What the one who says “Subhaan Allaah wa bi hamdih, ‘adada khalqihi…” achieves of knowing Allah, exalting Him and glorifying Him, when his dhikr is connected to the huge numbers mentioned, is far greater than what is achieved by the one who merely says Subhaan Allah. This is called multiplied dhikr and it is greater glorification and praise than regular dhikr, hence it is better than it. (Source: islamqa.info)
(Read more about Quranic Duas on Healing and Shifa)
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This is real enlightening. may we be amonst those whose hearts and tongs are moist with dhikr of Allah SWA, Amin. Jazakhallah khairan.