Imam Khomeini explained and shed light on the subject through his works as following:
Be of the party of Allah; restrain yourselves from the splendor and glitter of life and artificiality.
A ruhani (clergyman) who considers himself a follower of ‘Ali ibn Abi Talib, peace be with him, is not possibly tempted by the world.
The root of all these conflicts which have no specific sacred aims is love of this world.
The prophets of God were raised in order to train the people, to develop humanity, and to remove them from ugliness, filth, corruption, pollution, moral turpitude, and to acquaint them with virtue and good manners.
If you take steps for the sake of God, God the Almighty is the turner of the hearts: He will turn hearts in favor for you.
Except for the unique Creator pay attention to no one.
The heart of man is like a mirror, clear and bright, and because of too much attention of this world and too many sins, it becomes dark.
How can one enter the presence of the Lord and the guest house of the Lord of lords which is the source of greatness with spiritual pollution, vices, and sins of the body and soul?
Fear God! Beware of the aftermath of your deeds! Wake up from the sleep of negligence!
Think a little, look ahead, weigh the consequences of yours deeds, keep in mind the perilous events which take place after death, the pressure of the grave, the world of barzakh (the period between death and resurrection), and do not neglect the difficulties which will follow that.
Hell is lit with the ugly works and deeds of man.
If a man does not light the fire by his works and deeds, hell will be extinguished. The interior of this disposition is hell. To approach this disposition is to approach hell.
That which occurs to this ‘alim in the next world is something which has been prepared in this world.
Before loosing the opportunity, you should try to remedy this.
You young people are advancing toward old age, and we old people toward death.