I’ll assume you mean: “Please write a simple letter based on / using Jain religion (Jain principles).”

Here is a very simple, easy letter you can use or modify.

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Sample Letter Based on Jain Principles

To, My dear friend,

Jai Jinendra,

I hope you are healthy and peaceful.

I am writing this letter to share a little about Jain dharma and how I am trying to use it in daily life. Jainism teaches us three main things:

1. Ahimsa (Non-violence) –

Try not to hurt anyone by mind, speech, or body. Speak softly, think kindly, and avoid anger and hatred.

1. Satya (Truth) –

Always try to be honest, but with kindness. If truth can hurt someone, speak it gently and at the right time.

1. Aparigraha (Non-possessiveness) –

Try not to be too attached to things, people, or desires. Be satisfied with what you have and share with others.

I am trying to follow these teachings by:

• Eating with awareness and avoiding unnecessary harm to living beings.
• Controlling my anger and speaking politely.
• Reducing my greed and unnecessary wants.

Jain dharma also reminds us that every soul is pure and has the power to become a Siddha (liberated soul). Remembering this gives me strength to improve myself every day.

I wish that we both try to live with more ahimsa, peace, and self-control.

With prayers for your spiritual progress,

Your well-wisher, [Your Name]

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If you meant a different kind of “letter” related to Jain religion (like a formal application, school essay letter, etc.), you can adjust the format above easily.