Answer

Yes, a Tirthankar uses manovargana only in the ordinary, embodied state before kevalajnana. After attaining omniscience, a Tirthankar does not depend on manovargana for thinking in the usual way.

Explanation

In Jain Dharma:

• Manovargana is the subtle pudgala used for the functioning of the mind.
• Before omniscience, even a Tirthankar has a worldly body and mind, so that subtle matter is present in that state.
• After kevalajnana, the Tirthankar becomes a Kevali and no longer needs ordinary mind-based cognition.
• At that stage, knowledge is direct and complete through omniscience, not through manovargana-based thought.

Spiritual Understanding

This shows an important Jain principle:

• The mind is a material support in worldly life.
• Liberation and omniscience are beyond ordinary mental processes.
• A Tirthankar’s greatness lies in having fully transcended ignorance and the limitations of normal mind activity.

Takeaway

So, the simple answer is:

• Before kevalajnana: Yes
• After kevalajnana: No, not in the ordinary sense

If you want, I can also explain the difference between manovargana, mind, and kevalajnana in very simple Jain terms.