Here are a few key verses and ideas about tapas from Jain sutras, with very brief excerpts and notes on how Digambar and Śvetāmbara traditions interpret them. I’ve kept to short quotes and simple explanations.

1) Uttarādhyāyana Sūtra on the nature of tapas and scriptural discipline

• Short excerpt: “Scriptures mean what has been heard. … study of these, keep the passions away.”
• Meaning (arth): Tapas is connected to right conduct and study of the scriptures; restraint of passions comes through guidance from the revealed texts and disciplined practice. This line is often cited to show how external and internal practices support purification when joined with scriptural learning.
• Tradition note: Śvetāmbara and Digambara both emphasize tapas linked to scriptural study, but ritual details may differ in practice and chapter numbering between their Agama collections.
• Source excerpt in context: Uttarādhyāyana Sūtra 23/53 (as explained in traditional paraphrase and translations).
• You can read more here

2) Tattvartha Sutra on six external tapas (bahya-tapas)

• Short excerpt: “The six kinds of external austerities … are fasting, reduced diet, [and other external practices].”
• Meaning (arth): There is a codified list of external austerities that help curb passions and karmic influx. These are collective practices categorized as bahya tapa and are meant to purify the mind and body when done with the right intention.
• Tradition note: Tattvartha Sutra is revered by both Śvetāmbara and Digambara traditions; the exact enumeration of practices and emphasis may vary slightly by commentator, but the framework is shared.
• You can read more here

3) Uttarādhyāyana Sūtra: chapter content on various tapas

• Short excerpt: “There are two kinds of austerities: external and internal.” (contextual shorthand from several discussions of Uttarādhyāyana text)
• Meaning (arth): The sutra delineates two broad categories of tapas. External tapas involve bodily practices (like fasting, posture, etc.), while internal tapas involve mental and ethical disciplines (like repentance, humility, contemplation). The aim is to burn karma and purify the soul when practiced with proper intention.
• Tradition note: Both Digambar and Śvetāmbara follow this two-fold schema, though the specific lists and practices are elaborated differently in their own canonical materials.
• You can read more here

4) Practical examples of tapas in practice (modern summaries from Jain Knowledge)

• Short excerpt: “Ekasana is one meal in one sitting per day.”
• Meaning (arth): Ekasana is a common external tapas practice used to discipline appetite and cultivate self-control; it is often a preparatory or companion practice before more stringent fasts.
• Tradition note: Practiced by both Śvetāmbara and Digambara with variations in rules or timing according to acharas; the essence remains the same: reducing food intake to calm the senses and aid spiritual effort.
• You can read more here

5) External tapas as listed in modern summaries (for quick reference)

• Short excerpt: “The six kinds of external (bāhya) austerities (tapa) are fasting … and mortification of the body.”
• Meaning (arth): This captures the core idea that external tapas encompasses a range of bodily disciplines—fasting, reducing intake, controlled nourishment, limited living conditions, and physical disciplines—to aid purification and detachment.
• Tradition note: These categories are common across Śvetāmbara and Digambara manuals, though exact practices and rules may differ by monastic lineage and teacher.
• You can read more here

6) Siddhi Tap and its significance (overview)

• Short excerpt: “Tapas … destroy karmas and purify the soul.”
• Meaning (arth): Siddhi Tap refers to austere practices undertaken to attain deep spiritual results; the primary goal is purification and liberation, not personal gain. It is discussed across Agamas and later commentaries as part of disciplined spiritual practice.
• Tradition note: While the term “Siddhi Tap” is used in modern explanations, the core Jain texts discuss tapas as a broad path toward kevala-jñāna and mokṣa; both Śvetāmbara and Digambara traditions recognize its importance.
• You can read more here

7) A note on differences between Digambar and Śvetāmbara

• Short excerpt: Both traditions affirm external (bahya) and internal (abhyantara) tapas, with a shared aim of purifying the soul and burning karma.
• Meaning (arth): The overarching framework is the same, but there can be differences in which specific practices are emphasized, how they are scheduled in rituals (paryushan, chaturmas, etc.), and the exact textual references within their respective Agama canons.
• Tradition note: For exact practice details, consult the acharas and monastic rules within each tradition; the core concept remains aligned.
• You can read more here

If you’d like, I can pull more precise, line-by-line short quotes from specific sutras (Uttarādhyāyana Sūtra chapters on Tapasādhyāyana, Ācāranga Sūtra, etc.) and specify which passages are treated differently by Digambara vs Śvetāmbara commentators.