Imam sheds light on the subject through his famous work "Combat with the Self" as following:
The tongue of supplication is very different from the other tongues by which those greats explained precepts. They have explained most spiritual, metaphysical, and precisely divine matters, and that which is related to knowledge of Allah by the tongue of supplication.
But we recite supplications to the end and unfortunately pay no attention to their meanings, and we fail to understand what they really want to say.
In this munajat we read: “O my God! Grant that I may be perfectly cut off from all else but You, and enlighten the vision of our hearts by the radiance of vision toward You, until the visions of the heart tear through the curtains of light and attach to the Source of Greatness and our souls come to belong to Your Exalted Sanctity.”
It is possible that the meaning of the sentence, “O my God! Grant that I may be perfectly cut off from all else but You,” is that prior to the blessed month of Ramadan, divinely aware people should get ready and prepare themselves for cutting themselves off and avoiding worldly pleasures (and this avoidance is that very being cut off perfectly from all else but Allah). Being perfectly cut off from all else is not something easily obtained, Imam Khomeini further explained.
It requires extra hard practice, going to some lengths, spiritual exercises, perseverance, and discipline, until one is able to fix one’s attention completely on nothing but God and cut himself off from all else. If someone is able to do this, he has reached a great felicity. However, with the least attention to this world it is impossible to be cut off from all else but Allah.