Imam Khomeini (ra): "Today, world peace is such that all countries are under the political influence of the superpowers; they observe a control everywhere and have schemes for defeating every group. The most important of these is sowing discord among brothers.
Muslims should be awake, Muslims should be alert that if a dispute takes place among Sunni and Shi'ite brothers, it is harmful to all of us, it is harmful to all Muslims. Those who want to sow discord are neither Sunni nor Shi'ite, they are agents of the superpowers and work for them.
Those who attempt to cause discord among our Sunni and Shi'ite brothers are people who conspire for the enemies of Islam and want the enemies of Islam to triumph over Muslims. They are the supporters of America and some are supporters of the Soviet Union.
I hope that through considering this Islamic precept - that all Muslims are brothers - all Islamic countries will triumph against the superpowers and succeed in actualizing all Islamic ordinances.
Muslims are brothers and will not be segregated by the pseudo-propaganda sponsored by corrupt elements. The source of this matter - that Shi'ites should be on one side and Sunni on the other - is on the one hand ignorance and on the other hand propaganda of the foreigners.
If Islamic brotherhood comes to the fore among Islamic countries, such will become a great power which none of the global powers will be able to cope with.
Shi'ites and Sunnis brothers should avoid every kind of dispute. Today, discord among us will only benefit those who follow neither Shi'ia nor Hanafi. They neither want this nor that to exist, and know the way to sow dispute between you and us. We must pay attention that we are all Muslims and we all believe in the Qur'an; we all belive in Tawheed and must work to serve the Qur'an and Tawheed."
Additional sayings of Khomeini's (RA) view on unity:
"Invitation to Islam is principally invitation to unity."
"I have repeatedly declared that in Islam things like race, language, nationality and geography are not topical issues, Muslims, whether Sunni or Shiite are brothers and therefore, equals and all enjoy all of the Islamic privileges and rights."
"If you are interested in the independence of Iran, have religious unity!"
"We the Shiites and sunnis must be brothers to one another and not let others come and take away all we have."
"It is incumbent on all Muslims to be together."
"Wholesome and creative speeches in healthy, quiet surroundings are useful to develop unity and understanding and prevent disputes and will please the Lord."
"Do not keep saying 'unity' but not go after it. Be active together, you are brothers to one another."
"Schism and disunity belong to Satan whereas union and unity of the word are from God."
"My dear ones, avoid division and disunity for these are the inspirations of Satan."
"If you and I oppose each other, any accruing result shall be gained by others."
"This nationalism is the source of the miseries of Muslims."
"Our Movement is Islamic before being Iranian."
"Nationalism is planned by plotters to create discord among Muslims and it is being propagandized by agents of colonialization."
"Those who, in the name of nationalism, factionalism, etc, create schism and disunity among Muslims, are armies of Devil, opponents of the holy Quran and helping agents of the superpowers."
"Resolve difference of tastes in a good, brotherly manner."
"If our tastes or our views differ, we must sit down and discuss them in a calm atmosphere, go over our problems and solve them."