Answer

A very suitable Jain mantra for purity of mind and protection from lustful thoughts is the Namokar Mantra:

णमो अरिहंताणं
णमो सिद्धाणं
णमो आयरियाणं
णमो उवज्झायाणं
णमो लोए सव्वसाहूणं

Meaning

I bow to:

• the Arihants, who have conquered inner enemies like attachment, anger, ego, greed, and lust,
• the Siddhas, the liberated pure souls,
• the Acharyas, the spiritual leaders,
• the Upadhyayas, the spiritual teachers,
• all Sadhus and Sadhvis in the world.

How to Practice

• Chant the Namokar Mantra slowly and with devotion.
• Do it especially when lustful thoughts arise.
• Sit calmly, close your eyes, and focus on the purity of the Arihants and Siddhas.
• Repeat it 9, 27, or 108 times according to your capacity.

Spiritual Understanding

In Jain Dharma, lust is a form of attachment and passion. The goal is not to hate the body, but to purify the soul by reducing attachment, desire, and imagination connected with sensual pleasure.

Along with mantra, practice:

• Brahmacharya according to your stage of life,
• avoiding impure thoughts, images, and company,
• eating simple and controlled food,
• doing Samayik or quiet reflection regularly,
• remembering that the soul is pure, separate from the body.

Takeaway

Whenever the mind is disturbed by lust, sincerely chant the Namokar Mantra and remember: “I am a pure soul; these passions are temporary and separate from me.”