Answer

In Jain philosophy, one parmanu combines with other parmanu because pudgala has the natural property of joining, binding, and forming larger material units called skandha.

Explanation

A parmanu is the smallest indivisible unit of matter in Jainism. It does not combine by choice or by consciousness. It combines naturally with other parmanu due to the inherent nature of matter itself.

When parmanus come together:

• they form a skandha or material aggregate
• they may remain joined for a time
• they can also separate again later

This joining is part of the changing nature of pudgala. In simple words, matter has the capacity to:

• unite
• transform
• divide

Spiritual Understanding

Jain Dharma teaches that matter is always in motion and transformation. Understanding how parmanu combine helps us see that the physical world is temporary and ever-changing.

This also reminds us:

• the body is made of material particles
• only the soul is चेतन, conscious
• attachment to matter leads to bondage

Takeaway

One parmanu combines with other parmanu through the natural binding property of pudgala, forming a skandha. This is a basic principle of Jain atomism and material transformation.