That is the reason that saints ask us not to get attached with the things or people of this world. Even if we have to remain with these things or people in the world then just remain like a drop of water on a Lotus flower, where though it is there on it but it is not attached or touched by it. Basically the nature of our mind is so that it gets attached to some object, place or person badly. In such a state our mind is swayed by the emotions & we always think of that object, place or person & without it, our life seems impossible. So in all such cases if our mind is attached to them greatly then great shall be the pain to the mind during separation from them. Same applies to other material things like your home, car, money etc. So if our mind is attached to these things greatly, so great shall be the pain to our mind during its separation.
As per the teachings of Siddhartha Gautama (Buddhism), craving for worldly things is said to be the cause of all suffering that one experiences in human existence. The extinction of this craving leads one to ultimate happiness, or Nirvana. Nirvana means "cessation", "extinction" of suffering. It is also known as "Awakening" or "Enlightenment". As per the teachings of Gautama Buddha, suffering is an inevitable part of life as we know it & the cause of this suffering is attachment to, or craving for worldly pleasures of all kinds. The suffering ends when the craving and desire ends, or one is freed from all desires.
In this world we are getting deluded by the delusive energy of God called Maya. She puts our minds through the pains and sufferings of life & we all our life feel these regularly. Our mind is always full of worries, anxieties, pains of day to day life, diseases and mental sufferings. Sometimes that delusive energy of God called Maya removes a little pain from our life & gives us a small happiness & pleasure. We at that time feel that we have got fully rid of all the problems & miseries of the life & we again rush with more vigor towards the jungle called life. We forget that all those miseries & pains of life are still there & if we do not find the true answer to get rid of all these sufferings then we shall always feel the same way all through life & shall get reborn again to live a life of pain & sufferings. To get rid of all these pains & sufferings permanently, is to know your true self which is your Soul & Supersoul (God). Once you know your Soul & Supersoul (God) then all the miseries of life shall go away from your life.
In Bhagwat Gita Lord Krishna teaches Arjuna that if a person's mind is unattached internally to worldly things then that person lives in this world just like a water drop living on a lotus leaf, which is there on it but is still not attached to it.
"brahmany adhaya karmani
sangam tyaktva karoti yah
lipyate na sa papena
padma-patram ivambhasa" (Bhagwat Gita: Chapter Five verse 10)
"Sri Krishna said: One who performs his duty without any Attachment, surrendering all the results unto the God, is unaffected by sinful action, as the Lotus leaf is untouched by water."
Below is a story regarding a monk who lived a life of detachment in this world:
"Two monks were returning to the monastery in the evening. It had rained and there were puddles of water on the road sides. At one place a beautiful young woman was standing unable to walk across because of a puddle of water. The elder of the two monks went up to a her lifted her in his alms and left her on the other side of the road, and continued his way to the monastery.
In the evening the younger monk came to the elder monk and said, "Sir, as monks, we cannot touch a woman?"
The elder monk answered "yes, brother".
Then the younger monk asks again, "but then Sir, how is that you lifted that woman on the roadside?"
The elder monk smiled at him and told him "I left her on the other side of the road, but you are still carrying her."
So remain in this world like the one who is not attached to the things & beings of this world. Don't say to yourselves, 'I have money, home, I have a son, I have a daughter, I have numbers of men and maids for my service, I have precious gold etc; do not cling to these things with craving and desire. Simply do not get attached to anything very much that you cannot leave it. Again, just live your life like a water drop living on a lotus leaf, which is there on it but is still not attached to it.
Jai Sri Krishna