Dukha (pain/suffering) and Sukha (happiness) in Jainism are not just feelings but are tied to karma and the soul’s bondage. A dukha-dukha (continual pain) state can gradually transform into a sukha (true spiritual happiness) when the soul stops attracting new karmas and sheds the ones it already has.

How the shift happens (in simple terms):

• Stop new karmas: follow samvara (stopping the influx of karma) by living with right conduct and self-control.
• Shedding old karma: work on nirjara (shedding) through disciplined practice, repentance, and steady meditation on the soul’s true nature.
• Path to sukha: cultivate samyak darshana (right belief), samyak jnana (right knowledge), and samyak charitra (right conduct). This reduces passions (kasāya) like anger, ego, deceit, and greed, which are the main engines that bind karma.
• The fruit: as karma is reduced and shed, the soul’s true nature—infinitely pure, blissful, and wise—becomes more evident. This is the sukha that Jainism teaches: a lasting inner peace that is independent of temporary pleasures.

Traditional emphasis:

• The process is personal effort plus divine guidance from the Jain path. It culminates in moksha (liberation) when all karmas are burnt away.
• The same teaching is found across Digambara and Śvetāmbara traditions, though they may differ in ritual details and monastic practices. The essential idea remains: true happiness comes from freedom from karma, not from worldly comforts.

If you’d like, I can add a short, traditional verse (arth) that expresses this idea or point you to a specific Jain text that discusses asrava, samvara, and nirjara in more detail.