What causes this possessive Clinging to what is Painful?

Friends:
What causes this possessive Clinging to what is Painful?

At Savatthi, while seated, Venerable Rādha asked the Blessed Buddha:

Venerable Sir, one says: "A Being!" In what way, Sir, is one a being?

When one is stuck, Rādha, tightly stuck, in desire, lust, delight, & craving for form, then one is called a being! When one is trapped within yearning, longing, fascination, and craving for feeling, for perception, for mental constructions and for all the various forms of consciousness, in so far as this violent force of clinging is still active, then one is defined as a being...

Imagine, Rādha, some small boys & girls who are playing with sand castles.

So long as they are not devoid of desire, affection, attraction, delight, & fascination for those sand castles, then they will like them, play with them, treasure & guard them, be obsessed with them & treat them possessively...

But as soon as the small boys & girls lose their desire, delight, affection, attraction, and fascination for those sand castles, then they scatter them with their hands & feet, bulldoze them, shatter them, and eradicate them!

So too should you, Rādha, scatter form, destroy it, shatter it, eradicate it by practicing the stilling of all craving for form. So too should you scatter feeling, scatter perception, scatter constructions, & scatter consciousness, demolish it, shatter it, tear it down, by the practicing of the destruction of craving. For this destruction of craving, Rādha, is peace, is all freedom, is pure bliss... Absence of craving, Rādha, is Nibbāna...

More on Craving (Tanhā): The 3 kinds of Craving, Origin_of_Suffering,
Craving_is_Pain, Cut_Craving, Craving_is_Cause, Elemental Analysis,
Ceasing_of_Suffering, Craving_is_Catastrophic, Quenched,
The_2nd_Noble_Truth_on_The_Cause_of_Suffering.