In Jainism, the Navkar Mantra (Namokar Mantra) is the most revered and fundamental prayer. It can be chanted in various ways:

Mansik Jaap (Mental Chanting): Yes, mansik jaap—silently reciting the mantra in your mind without moving your lips or tongue—is considered very powerful and pure in Jainism. This method minimizes disturbances, reduces the chances of hurting any living beings through sound, and increases concentration (dhyan).

Other Methods:

• Vachik Jaap: Chanting aloud with the mouth.
• Upanshu Jaap: Whispering softly, barely audible to oneself.

Best Way According to Jainism: All methods are acceptable, but mansik jaap is highly recommended, especially when one seeks deep concentration and wishes to observe utmost non-violence (ahimsa). It can be done anywhere, at any time, and does not disturb others or living beings around.

Guidelines for Chanting:

• Sit in a clean, quiet place, preferably in a meditative posture.
• Focus your mind on the meaning and reverence of the mantra.
• Maintain purity of thought, body, and speech.
• If possible, face the east or north direction.
• Chant with devotion (bhav) and not just mechanically.

Summary: Mansik jaap of the Namokar Mantra is highly respected in Jainism and is an excellent way to practice mantra recitation with utmost concentration and non-violence.