In Digambar Jain tradition, Ashtami and Chaturdashi are considered highly auspicious and spiritually important days for tapasya, sadhana, and self-purification.

Significance of Ashtami

• Ashtami means the 8th day of the lunar fortnight.
• It is often observed as a day for:

- Upvas or partial fasting - Puja and swadhyaya - Meditation and repentance

• Many Digambar Jains regard Ashtami as a spiritually strong day for increasing vairagya and reducing karmic bondage.

Significance of Chaturdashi

• Chaturdashi means the 14th day of the lunar fortnight.
• It comes just before Amavasya or Purnima, so it is seen as a time of completion and inner cleansing.
• Digambar Jains often observe it for:

- Fasts - Pratikraman - Alochana and repentance - Deep contemplation on the soul and karma

Why these days are important

In Jain Dharma, these tithis are valued because they support:

• Reduction of passions like anger, ego, deceit, and greed
• Discipline of the body and mind
• Spiritual upliftment
• Progress on the path of moksha

In simple words

For Digambar Jains, Ashtami and Chaturdashi are sacred days for restraint, devotion, fasting, and आत्मशुद्धि — purification of the soul.

If you want, I can also explain the difference between Ashtami/Chaturdashi observance in Digambar and Shwetambar traditions.