Answer

In Jain tradition, the Jain muni associated with 700 years of sādhanā is generally understood to be Muni Nandishen.

Explanation

Muni Nandishen is remembered in Jain tradition for his extraordinary spiritual discipline, deep devotion, and long period of austerity and practice. His life is often cited as an example of intense tapas, samyam, and unwavering dedication to the path of liberation.

Spiritual Understanding

The main lesson from such accounts is not merely the number of years, but the depth of:

• Renunciation
• Self-control
• Faith in Dharma
• Spiritual endurance
• Purification of karma

In Jain Dharma, true greatness of a muni lies in conquering inner passions such as anger, pride, deceit, and greed.

Takeaway

The muni remembered for 700 years of sādhanā is Muni Nandishen, whose life inspires deep commitment to Jain spiritual practice.