Here are some deep, Jain-dharma–rooted lines on Taap (tapas/austerity):

• Tap is the inner fire that burns kashāyas (anger, pride, deceit, greed); when they cool, the soul shines cool like a moon.
• External fasting is the door; internal purity is the home. Enter both, but live within the home.
• Food-less fasting with passion is only hunger; passion-less restraint is true Tap.
• The highest heat of Tap is felt not on the tongue or skin, but in the melting of ego.
• When taste loses its rule over you, samatā (equanimity) begins to rule within you.
• Tap measured by days is small; Tap measured by reduced attachment is vast.
• Every denied craving saves you from a future bondage; every borne hardship unknots a past bondage.
• Tap is successful when compassion grows and claims shrink.
• In Jain dharma, bahya (external) Tap prepares the field; abhyantara (internal) Tap plants the seed.
• Endure heat, cold, and insult alike—this is kaya-kleśa only when serenity remains unbroken.
• True Tap is gentle to others, strict to oneself, and honest before the Self.
• The sweetness of Tap is tastelessness; from rasa-parityāg arises rasa of the soul.
• Prayashchitta without humility is counting words; humility with silence is living Tap.
• Serving others (vaiyāvṛttya) is Tap because it thins “I” and nourishes “we.”
• Study (svādhyāy) is Tap when each truth read is one defect reduced.
• Meditation (dhyān) is the crown of Tap—where hunger, honor, and hurt lose their voice.
• Tap done for show gathers karma; Tap done in secrecy scatters karma.
• When the mind stops bargaining—“how long, how tough, how famous”—Tap begins.
• The sign of completed Tap: you seek fewer things outside and find more peace inside.
• A little less intake, a little more insight—that is the daily arithmetic of Tap.

For clear basics on types of Tap and the primacy of internal austerities, see: and a concise note on “Samyag Tap”: