From the statements of his eminence Grand Ayatollah Mousavi Ardebili:
The unity means two persons, two groups or two denominations live together and do not fight with each other, and have no any quarrel and enmity. Do not attack each other and do not infringe the rights of each other and tolerate each other.
In fact, the meaning of unity which we mentioned, is not only the meaning of unity, but also is the meaning of peaceful life and non-aggression. Non-aggression in its place is very useful and desirable and necessary; however, it is different with the unity, and these two are not the same.
Allah said in chapter al-Anfal (spoils of war): "وَأَطِيعُوا اللَّهَ وَرَسُولَهُ وَلَا تَنَازَعُوا فَتَفْشَلُوا وَتَذْهَبَ رِيحُكُمْ وَاصْبِرُوا إِنَّ اللَّهَ مَعَ الصَّابِرِينَ." “Obey Allah and his messenger (s.) and do not dispute with one another, lest you should lose courage and your resolve weaken, have patience, Allah is with those who are patient.”
This verse is about non-aggression, i.e. do not conflict and fight with each other and tolerate each other.
Tolerance is not easy, therefore, Allah Said: “واصبروا”, be patient; have resistance, have patience and fortitude.
The unity means two persons or two groups or two countries, in terms of uniqueness reach to the point where they favor good and benefit of the other side as their good and benefit and evil and harm of the other side as their evil and harm. And they try to defend the other side’s rights. The unity has a higher and deeper meaning in comparison with non-aggression.
Allah, the Almighty said: "واعتصموا بحبل الله جمیعاً ولا تفرقوا"
“And hold fast to the bond of Allah, together, and do not scatter.
This verse is about unity. Allah commands about the Union in this holy verse. However, oneness and brotherhood were not indicated in this holy verse, but two verses later, Allah said:
"ولا تکونوا کالذین تفرقوا واختلفوا" “Do not follow the example of those who became divided and differed with one another.”
Imam Ali (AS) said with fine words about the people of Basra: You people of Basra! just your bodies are together.
When a society is the same as the people of Basra at that time, man looks and he sees a crowd of a hundred thousand, two hundred thousand or five hundred thousand. But these are all single. All are one. Everyone is just himself. Anyone seeking only its own interests and disposal losses and is no longer work with one another. "
Along with the Revolution, Grand Ayatollah Mousavi Ardebili’s Friday Prayers sermon, page 317-318.