In Jainism, ahimsa (non-violence) is the highest virtue and should govern thoughts, speech, and actions. If someone physically harms you, the teaching is to avoid violence in return and to respond with calm, non-harmful conduct as far as possible.

Key points:

• Self-defense: Jain ethics favors preserving life with the least possible harm. If you must defend yourself, the response should aim to stop the harm with minimal violence and without seeking revenge.
• After an incident: regret is not the goal; rather, you should acknowledge what happened and use the opportunity to cleanse yourself through pratikraman (confession of faults), forgiveness ceremonies, and acts of compassion.
• Intent matters: violence done with hatred or anger contradicts ahimsa; even accidental harm should be faced with remorse and corrective actions.
• Broader practice: cultivate ahimsa in all aspects of life—live simples, speak truth with gentleness, and practice forgiveness and loving-kindness toward all beings.

If you’re asking about a specific situation (e.g., self-defense, defense of others, or harm caused accidentally), I can tailor the guidance accordingly.