According to Imam Khomeini, the human being's passions are not limited to one, two, three, ten or even one hundred.
The human being's greed is also unlimited by taking one country, two countries or ten, he noted.
To shed light on the issue, Imam Khomeini said as following:
The Prophets were assigned to limit them, to bring them under control, to control this unleashed animal who believes in no limits.
If this creature is left alone and free to itself and if one is not trained, one becomes so unleashed that one wants everything for one's own sake and seeks to sacrifice everybody for one's self.
The Prophets were assigned to bring them under control and to give them some criteria. After one is leashed, then one will be shown the path in order to achieve those perfections which will cause one happiness and prosperity.
The world and this nature are not the only things taken into account, rather, the world for the Prophets is a path and a means to achieve an exalted goal which we do not know, but they know. The Prophets knew where one will end up if one is unleashed.
They also knew where one will end up if one is leashed and if one uses one of the ways to achieve the exalted grades of humanity.
The whole world is not the ultimate goal before the Prophets. Rather, it is a path to be followed to reach the destinations which is the high grade of humanity. If a creature reached that high human grade, one will achieve a happiness which is not limited just to this world. The ultimate goal is the world behind this one.
The 'selves' of mankind in this world varies according to creation but they undergo a lot of differences due to the various training of different environments. In one place, the training is antihuman and immoral while in another, the training is human.