Answer

A normal person cannot know with absolute direct certainty that someone is a kevaljnani unless that certainty comes from authentic Jain authority and tradition.

Explanation

In Jain Dharma, kevaljnana is perfect, complete knowledge. Because of this:

• A non-kevaljnani cannot directly verify another being’s kevaljnana by ordinary senses.
• We may only know indirectly through:

- authentic Agam and tradition, - the person’s complete freedom from attachment and passions, - their teaching being perfectly true and non-contradictory, - recognition by the Sangh or established Jain tradition in the case of great souls like Tirthankars.

So for us, it is mostly a matter of shraddha, inference, and scriptural authority, not direct omniscient proof.

Spiritual Understanding

Jain Dharma teaches humility. We should not claim certainty where we do not have direct knowledge.

What matters most is:

• following the path of right faith, right knowledge, and right conduct,
• respecting true spiritual greatness,
• and not being distracted by trying to “prove” everything by ordinary perception.

If someone truly is kevaljnani, that reality is beyond our limited senses.

Takeaway

We cannot know a kevaljnani the way a kevaljnani knows. We can only recognize through scripture, tradition, conduct, and faith — not through ordinary eyesight alone.