The remembrance of Allah is the life of the hearts; there is no life for them except through it. Al-Bukhari reports in his Saheeh from Abu Musa Al-Ash’ari (may Allah be pleased with him), that the Prophet ﷺ said:
“The example of the one who remembers his Lord and the one who does not remember his Lord is like that of the living and the dead.”
The hearts find no reassurance, no tranquility, no true delight, and no real happiness except through the remembrance of Allah, the Almighty and Majestic.
Those who believe (in the Oneness of Allah – Islamic Monotheism), and whose hearts find rest in the remembrance of Allah, Verily, in the remembrance of Allah do hearts find rest. (Ar-Ra’d 13:28)
Alee ibn Abee Talhah (rahimahullah) reported that Ibn Abbas (Allah be pleased with them both) stated regarding Allah The Most High’s statement
اذكروا الله ذكرا كثيرا
Remember Allah with much remembrance. (Al-Ahzaab:41)
Verily, Allah did not obligate an obligation upon his servants except that he legislated a fixed limit for it (1), and then excused its performers when they are in a situation when they are excused (2), except in the case of dhikr (remembrance of Allah) for indeed Allah did not legislate a limit for it and nor is a person excused for abandoning it, except when compelled. Allah said,
فَٱذۡڪُرُواْ ٱللَّهَ قِيَـٰمً۬ا وَقُعُودً۬ا وَعَلَىٰ جُنُوبِڪُمۡ
remember Allah standing, sitting down, and (lying down) on your sides (An-Nisaa:103)
night and day, at land or sea, whilst travelling or resident, when wealthy and in times of poverty, in sickness and in health, in private and public and in all circumstances, He, The Mighty and Majestic said,
و سبحوه بكرة و أصيلا
And glorify His Praises morning and afternoon [the early morning (Fajr) and ‘Asr prayers]. (Al-Ahzaab:42)
so if you were to do that (in the manner mentioned by ibn Abbas (Allah be pleased with them both)) then Allah will send His Blessings upon you, and the Angels will supplicate for you.
Tafsir Al-Qur’aan Al-‘Adheem ibn Katheer vol.11 pgs.182-183
(1) e.g. obligatory prayers are a fixed number (five) with set number of raka’aat, obligatory fasts of Ramadhan are one month every calendar year.
(2) e.g. a traveller, sick person does not have to fast obligatory fasts, the woman on her menses does not pray or fast etc
If a person is put to trial and a calamity befalls him, what is the thing which will remove it from him? And how does a person turn to Allaah – The Mighty and Majestic – for protection, deliverance, help – whilst he is in this situation in which he is put to trial through these illnesses?
Through supplication; Allah will remove it from him through supplication. He invokes Allah to remove from him that which has afflicted him and to relieve him of it. Allah is Near [to all by his knowledge] Responsive [to the supplication of the one who supplicates to Him]. [Al-Hūd:61]
Secondly, if this calamity or affliction is due to a sin, then verily he repents to Allāh from this sin – from those sins which is the reason behind this punishment that came upon him.