Dust has its own significance.
All living and nonliving came out of dust.

Dust lives through your knowledge,
Its covers you in the form of perception.
First we accumulate Dust in the name of Education and when nearing death. We renounce our knowledge and become sage to clean our-self from accumulated dust.

Dust lives in the so -called Principle.
a known story and worth to repeat:

Two monks returning to the Monastery, They came near to the river and found a beautiful girl standing, afraid to cross the river because the river was overflowing, the older monk decided to cross the river and while crossing, he found the younger monk carrying beautiful girl on his shoulder and crossing the river.The two monks continue their journey before entering the gate of monastery, the older monk advised the younger monk about the principle not to touch woman.

The younger replied, I left her on the bank of the river but you are still carrying…

Now the above gives evidence, dust hides inside principles.

Dust takes back all creation
When you leave a thing few years untouched dust try to form…only to take back to original form

Dust is insignificant to man because it stays under his feet but he is unaware..it’s in his mind and it’s in his heart his very body is made out of dust. Hence, When he dies he does not become liquid but becomes dust.

he came out of it
he will go into it..