In Jain dharma, “anumodnā / anumodanā” means:

• to whole‑heartedly approve, rejoice in, or support someone’s act.

It can work in two very different ways:

1. Anumodna of Punya Karya (good deeds) – appreciating and supporting good actions
2. Anumodna of Papa Karya (bad deeds) – approving violence or wrong deeds (this is himsā and binds bad karma)

You asked for the benefit of anumodna, so below is about good / punya anumodna.

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1. Karmic benefit

When you truly rejoice in another person’s punya work (dān, tapas, swādhyāy, sadācār, etc.):

• You also bind punya karma, even if you did not do that act yourself.
• In Jain texts, punya arises from traya – krit, karit, anumodna (doing, making others do, approving). So sincerely approving good deeds gives punya like a small share of their merit.

Example: Someone does varsitap or big dān. If you feel from the heart, “Bahut sundar dān/tapas kiyā, khub khub anumodnā”, you also gain punya.

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2. Inner spiritual benefit

Right anumodna slowly changes the inner tendencies (bhāva):

• Jealousy (īrṣyā) reduces – instead of “why not me?”, you feel joy in others’ progress.
• Maitri (friendliness) and pramod (joy in others’ virtues) increase.
• You become more inclined to do such good deeds yourself in future.
• It supports samyak dṛṣṭi – you value dharma and punya wherever you see it.

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3. Social and family benefit

Good anumodna also helps around you:

• Encourages others to continue and grow in dharma – they feel supported.
• Creates a positive dhārmik environment at home and in sangh.
• Children learn to respect tapa, dān, pratikraman, swādhyāy, etc., when they hear parents doing anumodna.

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4. Very important caution

The same principle works negatively:

• If you approve or enjoy violence, lying, stealing, meat‑eating, etc., even silently, that is himsā through anumodna and binds pāpa karma.
• Hence in ahimsā, we are told:

“Na karo, na karāvo, na anumodno” – Don’t do, don’t make others do, and don’t approve.

So:

• Anumodna of good = powerful punya
• Anumodna of bad = serious papa

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For a short explanation on the power of anumodna in Jainism, you can also read here