The Prophet of Islam wanted to create unity of the word in the whole world; He wanted to place all the countries of the world under the word of monotheism, but the intentions of the sultans at that time on the one hand and the intentions of the Christian and Jewish scholars and the like on the other became an obstacle; He was prevented from doing so. Even now they are an obstacle.

Imam Khomeini (Peace be upon him)

Imam's Sahifah, vol. 2, p. 32