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

Imaam As-Sadi [may Allaah have mercy upon him] said:

With regards to what Allaah commanded and encouraged in the affair of sound unity and harmony, prohibition and warning against disunity and (blameworthy) disagreement, there are many texts of the Qur’an and Sunnah related to this great principle. Indeed, every sane person with the least common sense knows the benefit of this matter, the outcomes of its religious and worldly welfare, and the harms and corruption that are repelled by it. It is also not hidden that the moral strength that is based on truth revolves around this foundation, just as it is well known that what the Muslims were upon at the beginning of Islam in terms of uprightness in religious affairs, upright state of affairs and the honor that no one else could reach besides them, this was due to adherence to this principle, which they fulfilled as it should be fulfilled and were absolutely certain that it is the backbone of their religion. (see appendix a)

This further clarifies that Islam is the religion of mercy, blessing and benevolence, and it urges towards benefiting humankind. What this religion includes of mercy, excellent mutual dealings, the call to benevolence and prohibition against everything that contradicts these (characteristics), this is what makes it a light and radiance in the midst of the darkness of injustice, oppression, mistreatment and violation of the things that Allaah has made sacred. It is the religion that attracted the hearts of its fiercest enemies before they became acquaintance it, (but thereafter) they took shelter under its shadow. It is the religion that shows compassion and affection to its followers, until mercy, forgiveness and kindness began to flow from their hearts to their statements and deeds, and passed on to their enemies, until they became one of its greatest allies. Some of them entered it with good insight and strength of conscience, and among them were those who submitted to it, desired its rulings and preferred them over the rulings of the people of their religion, because of the justice and mercy in it.

Islam is the religion of (perfect) wisdom, the religion that is in conformity with sound innate natural disposition, and the religion of sound reasoning, righteousness and success. This principle clarifies what it contains of (sound) fundamental and subsidiary rulings, which are accepted by sound innate natural disposition and sound intellects, (perfectly) guided by the motive of truth and correctness, and that which it is based upon of (perfect) rulings and good order are (perfectly) suitable in every time and place.

All its information is firm established truth whose opposite can never be correct, and it is perfect reality applied in its perfect place as it should be. No knowledge has come – and it is impossible for it to come – prior or subsequent – that can truthfully criticize or belie it; rather all true sciences aid and support it, and it is the greatest proof regarding its own truthfulness. Indeed, the fair minded precise investigators have affirmed that the Qur’aan- without a shadow of doubt – guides to every useful science, be it religious, worldly or political. (see appendix b) There is nothing in Islamic law that would deceive sound minds, but rather there is in it that which pure minds would testify to its truthfulness, usefulness and righteousness. (see appendix c)

Also, its commands and prohibitions are all justice and there is no injustice in them. It has not commanded anything, except that it is pure goodness or the best in comparison to other things. And it has not prohibited anything, except that it is something absolutely evil or its corruption is more than its welfare. The more a person reflects on its rulings, the more he (or she) believes in this principle or knows that it is a revelation from the All-Wise, Worthy of all praise (Allah). (see appendix d) (1)

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Appendix a: Read articles by Shaikh Abu Khadeejah [may Allaah preserve him]:

I find it very distasteful when we speak and warn against the other sects… we as Muslims should all come together under the banner of the Shahādah.” Questions in the Manhaj: https://abukhadeejah.com/it-is-distasteful-when-we-warn-and-speak-against-the-other-sects/

An Exposition Of The Ikhwāni Principle Of Excusing Differences For The Sake Of Unity: “We excuse one another in that which we differ.” https://abukhadeejah.com/the-principle-of-ikhwan-we-excuse-and-overlook-one-another/
Listen to lecture by Shaikh Abu Khadeejah: Unity and a Dispraise of Splitting: https://www.salafisounds.com/unity-and-a-dispraise-of-splitting-by-abu-khadeejah/

Unity & Division Through the Eyes of the Salaf [the pious predecessors]: https://www.salafisounds.com/unity-division-through-the-eyes-of-the-salaf-khutbah-by-abu-khadeejah/

Differing in Matters Where there is Room for Ijtihād Should not be Allowed to Damage our Unity―Ibn Taymiyyah and Al-Fawzān: https://abukhadeejah.com/differing-where-there-is-room-for-ijtihad-should-not-damage-our-unity/

Differing in Matters where there is Room for Ijtihād Should not be Allowed to Damage our Unity―By Abu Khadeejah

Appendix b: Qur’anic Proofs Which Show that the Religion of Islam Embodies the Beneficial Contemporary Sciences and Professions: https://salaficentre.com/wp-content/uploads/2021/11/Quranic_Proofs_Pdf_final.pdf

Appendix c: https://salaficentre.com/2020/09/04/perils-of-having-good-suspicion-about-ones-intellect-harbouring-evil-suspicion-about-authentic-divine-texts-and-not-critically-examining-ideas-and-claims-of-the-people/

Appendix d: Shaikh Abu Iyaadh [may Allaah preserve him] stated: The wisdom of the Islamic Shariah: Cut off evils and harms to society from their very roots and enjoy the resulting freedom, ease and wholesome life. In contrast: the barbarity and backwardness of commercialising corrosive evils– usurious banking, alcohol, gambling–in order to profit from the masses through affairs in which their ruin and impoverishment lies–and then managing this commercialisation through legislation, policies, guidelines and so on to “limit the harms”. The result? Inescapable enslavement, bondage, disease and ruin of the masses for the enrichment of the few who peddle these vices. Where is the intellect?! http://www.shariah.ws/articles/suokooj-there-is-no-safe-limit-in-the-consumption-of-alcohol-and-the-prohibition-of-alcohol-in-the-quran.cfm

[Ref 1: Ad-Durra Al-Mukhtasar Fee Mahaasin Deen Al-Islaamiy. pages 13-20. slightly paraphrased]