Answer

Jainism distinguishes real substances from mere conceptual groupings by asking whether something has its own independent, enduring reality with qualities and changing modes.

In Jain philosophy:

• Substance is called dravya.
• A dravya is real because it possesses guṇa — qualities — and paryāya — changing modes.
• A mere conceptual grouping, such as “all triangles,” is not necessarily a real substance. It may be a useful mental classification, but it does not by itself become an independently existing reality.

So Jainism would generally say: the individual things may be real, but the category formed by the mind is not automatically a separate real substance.

Explanation

Jain metaphysics accepts that reality has both:

• particularity — each thing has its own concrete existence, and
• generality — things can be meaningfully grouped by shared features.

But Jainism does not treat every mental classification as an independently existing universal.

For example, if you group all triangles together:

• Each drawn triangle, imagined triangle, or physical triangular object may have its own mode of existence depending on context.
• The shared “triangularity” may be a valid basis for classification.
• But “the class of all triangles” is not thereby a separate substance existing over and above the individual cases.

A Jain thinker would likely say that such a grouping belongs to a particular standpoint, or naya. From one standpoint, the similarities are meaningful. From another standpoint, each triangle is distinct. Neither view alone exhausts reality.

This is where Jain anekāntavāda becomes important. Reality is many-sided:

• From the standpoint of similarity, we may speak of a general class.
• From the standpoint of individuality, only particular entities are being considered.
• From the standpoint of ultimate substance, only entities with their own qualities and modes count as substances.

Thus, Jainism avoids both extremes:

• It does not say that universals are completely meaningless.
• It also does not say that every conceptual universal is an independently real substance.

Substance in Jain Thought

A real substance, dravya, is not merely a cluster created by thought. It has:

• Persistence — it continues through change.
• Qualities — it has attributes inseparable from it.
• Modes — it undergoes modifications.
• Causal capacity — it participates in real processes according to its nature.

Classical Jainism recognizes fundamental substances such as:

• Jīva — soul or living substance
• Pudgala — matter
• Dharma-dravya — medium of motion
• Adharma-dravya — medium of rest
• Ākāśa — space
• Kāla — time

These are not arbitrary groupings. They are regarded as basic constituents of reality in Jain metaphysics.

Spiritual Understanding

This distinction matters because Jain Dharma is deeply concerned with seeing reality correctly.

Confusing a conceptual construction with a real substance can lead to wrong understanding. At the same time, denying all generality would also be incomplete, because ordinary and scriptural knowledge often uses categories.

Jainism therefore uses a careful middle approach:

• Concepts are useful.
• Categories can express real similarities.
• But only that which truly possesses substancehood, qualities, and modes is a real dravya.

This reflects the Jain commitment to intellectual non-one-sidedness, anekānta.

Takeaway

Jainism would not treat “all triangles” as a real universal substance merely because the mind can group them. It would say that such a category is valid from a limited standpoint, but a true substance is something with its own enduring nature, qualities, and changing modes.