Answer

“Mantra Vigyan” means the spiritual science of mantras in Jain Dharma.

Explanation

In Jain tradition, mantras are not seen as magic. They are sacred sounds used with:

• faith
• purity of mind
• right understanding
• devotion to the Arihants, Siddhas, Acharyas, Upadhyayas, and Sadhus

A book on Mantra Vigyan usually explains:

• the meaning of Jain mantras
• their spiritual importance
• proper pronunciation and meditation
• how mantra japa supports inner peace and self-purification

Spiritual Understanding

In Jain Dharma, the real power of a mantra comes from:

• right faith
• right conduct
• concentration
• reducing passions like anger, pride, deceit, and greed

So mantra practice is meant to help the soul become calmer, purer, and more disciplined.

Takeaway

If you are referring to a Jain book called Mantra Vigyan, it is generally about the sacred science and spiritual practice of Jain mantras.