In Jain Dharma, if a soul has once truly attained samyaktva and later falls into mithyatva, the important assurance is this:

The soul has already developed the seed of right faith. That seed is not lost forever. With right effort, right company, and reduced delusion, the soul can again rise toward samyaktva and then progress upward.

What is guaranteed?

For a soul that has genuinely tasted samyaktva, Jain tradition accepts that:

• the samskāra of right faith remains;
• the soul becomes more naturally inclined toward truth again;
• if the soul is bhavya and keeps making right effort, it can regain samyaktva;
• once samyaktva becomes firm and purified, it becomes the base for further spiritual ascent.

So the main guarantee is not automatic immediate liberation, but the inner capacity and destiny to return to right faith.

How to get back from mithyatva to samyaktva

To rise again from 1st gunasthān to 4th gunasthān, the path is the removal of mithyātva-darśana mohanīya through the following:

1. Listen to true Jain teachings

• Study the Tattvartha Sutra, Agamas, and teachings of true Jain gurus.
• Reflect on the nine tattvas and the difference between jiva and ajiva, bandha and moksha.

2. Strengthen right belief

• Reaffirm faith in the Arihants, Siddhas, Acharyas, Upadhyayas, and Sadhus.
• Cultivate firm conviction in karma, soul, bondage, and liberation.

3. Reduce kashayas

Mithyatva is strengthened by:

• anger,
• ego,
• deceit,
• greed.

To return to samyaktva, these must be weakened through:

• forgiveness,
• humility,
• straightforwardness,
• contentment.

4. Do pratikraman and repentance

• Honestly repent for wrong belief, wrong actions, and negligence.
• Pratikraman softens the mind and helps destroy deluding karma.

5. Keep good company

• Stay near samyagdrishti people, true Jain sangh, and noble spiritual guidance.
• Avoid those who increase doubt, pride, violence, or attachment.

6. Practice restraint

From the 1st gunasthān to the 4th, the soul rises when:

• wrong faith weakens,
• true faith becomes steady,
• vows begin to appear,
• and inner avirata is replaced by spiritual awakening.

From 1st to 4th gunasthān

1st gunasthān — Mithyātva

Wrong belief dominates.

2nd gunasthān — Sasādana-samyaktva

A very unstable touch of right faith appears.

3rd gunasthān — Mishra

Right and wrong are mixed.

4th gunasthān — Avirata-samyaktva

True right faith is established, even if full vows are not yet adopted.

The real method to reach the 4th gunasthān again

The soul must create clear tattva-ruchi — love for truth. That comes by:

• studying Jain truth deeply,
• doing sincere introspection,
• reducing passions,
• avoiding false ideas,
• and keeping unwavering faith in the Jain path.

In one line

To return from mithyatva to samyaktva, remove delusion, strengthen right faith, purify passions, and stay connected to true Jain teachings and noble company.

If you want, I can also explain this gunasthān journey in very simple Gujarati/Hindi style.