In Jain दर्शन, a Siddha does not mean the soul becomes the whole of existence. It means the jīva becomes fully purified and exists in its own perfect, liberated state.

So the difference is:

• Ordinary existence is mixed with bondage, karma, birth, death, suffering, and change.
• Siddha existence is pure, eternal, conscious, and free from karma.

A Siddha is not becoming everything. Rather, the Siddha becomes completely itself:

• infinite knowledge
• infinite perception
• infinite bliss
• infinite energy

In Jain philosophy, the soul is independent and individual forever. Liberation removes all limitations, but it does not erase individuality or merge the soul into another reality.

So when it is said that a Siddha is “existence itself,” the deeper Jain meaning is:

• the Siddha remains in pure being
• without dependence on matter
• without bondage
• without change caused by karma

Thus, existence changes in condition, not in essence.

• Ordinary being = bound existence
• Siddha being = liberated existence

The soul was always capable of that pure state; Siddhahood is the realization of the soul’s true nature, not becoming some different universal substance.