And remind, for verily, the reminding profits the believers

In The Name of Allah, The Most Merciful, The Bestower of Mercy.

Allah [The Exalted] stated: [وَذَكِّرۡ فَإِنَّ ٱلذِّكۡرَىٰ تَنفَعُ ٱلۡمُؤۡمِنِينَ – And remind (by preaching the Qur’an, O Muhammad) for verily, the reminding profits the believers]. [Adh-Dhaariyaat. 55]

Imam As-Sadi [may Allah have mercy upon him] stated regarding this Ayah:

Reminder is of two types- reminding by way of that which whose full details is unknown, however it is known in general by sound innate disposition and intellect. That is because Allah created the intellect upon the sound natural disposition to love good and give it precedence, hate evil and abstain from it, and His divine (commands and prohibitions) are in consonance with that. All the commands and prohibitions of the divine law is reminder. The complete reminder is to mention the good, the merits and welfare in what is commanded, and the harm found in that which is prohibited.

The second type of reminder is to remind the believers regarding that which is known to the believers, but they’ve become negligent and absentminded, so they are to be reminded and (the reminder) repeated to them so that it becomes firmly established in their minds, become attentive and act upon what they have been reminded, then they become active and enthusiastic which will bring about for them benefit and improvement.

Allah informs us that reminder benefits the believers, because what they possess of Imaan (sound faith), Khasyah (fear of Allah founded upon knowledge of the greatness of the one who is feared, and the complete and perfect Sovereignty and Dominion that is His), Inaabah (turning to Allah in obedience and avoiding disobedience etc) and seeking after Allah’s Pleasure, this necessitates (i.e. with the help of Allah) that reminder will benefit them, and makes the admonition more useful in such circumstance, just as Allah [The Exalted] said:

فَذَكِّرۡ إِن نَّفَعَتِ ٱلذِّكۡرَىٰ
سَيَذَّكَّرُ مَن يَخۡشَىٰ
وَيَتَجَنَّبُہَا ٱلۡأَشۡقَى

So remind (the people with this Qurʾān), where reminder (will) benefit (them); (for) he will receive reminder (and take admonition) who fears Allāh. But the one who is (decreed to be) wretched (in Allāh’s prior knowledge) will avoid it (by choosing disbelief) (and thus become wretched). [Surah Al-A’laa. Aayaat 9-11. Translation by Shaikh Abu Iyaad]

As for the one with neither Imaan nor ready to accept reminder, this one will not benefit -similar to the swamp land that is not benefitted anything by rain. With regards to these people, even if every (clear) sign came to them, they will not believe until they see the painful punishment”. [Paraphrased]

والتذكير نوعان: تذكير بما لم يعرف تفصيله، مما عرف مجمله بالفطر والعقول فإن الله فطر العقول على محبة الخير وإيثاره، وكراهة الشر والزهد فيه، وشرعه موافق لذلك، فكل أمر ونهي من الشرع، فإنه من التذكير، وتمام التذكير، أن يذكر ما في المأمور به ، من الخير والحسن والمصالح، وما في المنهي عنه، من المضار
والنوع الثاني من التذكير: تذكير بما هو معلوم للمؤمنين، ولكن انسحبت عليه الغفلة والذهول، فيذكرون بذلك، ويكرر عليهم ليرسخ في أذهانهم، وينتبهوا ويعملوا بما تذكروه، من ذلك، وليحدث لهم نشاطًا وهمة، توجب لهم الانتفاع والارتفاع.
وأخبر الله أن الذكرى تنفع المؤمنين، لأن ما معهم من الإيمان والخشية والإنابة، واتباع رضوان الله، يوجب لهم أن تنفع فيهم الذكرى، وتقع الموعظة منهم موقعها كما قال تعالى: { فَذَكِّرْ إِنْ نَفَعَتِ الذِّكْرَى سَيَذَّكَّرُ مَنْ يَخْشَى وَيَتَجَنَّبُهَا الْأَشْقَى }
وأما من ليس له معه إيمان ولا استعداد لقبول التذكير، فهذا لا ينفع تذكيره، بمنزلة الأرض السبخة، التي لا يفيدها المطر شيئًا، وهؤلاء الصنف، لو جاءتهم كل آية، لم يؤمنوا حتى يروا العذاب الأليم