We explore how the ordinary experience of dukkha becomes dukkha ñāṇa, understanding of the universal characteristic (samañña lakkhaṇa) of dukkha. We look at the how the perception of impermanence (anicca-saññā) creates anxiety when the heart intuits the groundless of experience, and how the unfolding of this anxiety is mapped by the dukkha ñāṇas of classical Theravāda Buddhism. Finally, we see how the experience of dukkha gives way to that of not-self (anattā), when the heart stabilises through the maturity of mindfulness (sati) and equanimity (upekkhā).