Bhagavad Gita 18.36
सुखं त्विदानीं त्रिविधं शृणु मे भरतर्षभ । अभ्यासाद्रमते यत्र दुःखान्तं च निगच्छति ॥
sukhaṃ tv idānīṃ tri-vidhaṃ śṛṇu me bharatarṣabha / abhyāsād ramate yatra duḥkhāntaṃ ca nigacchati
Translation
Now hear from me, bull of the Bharatas, the threefold happiness, in which one comes to delight through practice and reaches the end of sorrow.
Reflection
What practice tasted like punishment at first and now quietly carries you?
Read this verse in its chapter: Chapter Eighteen
Final triad in the diagnostic sweep, sukha. Happiness itself, the prize most people are chasing, is going to be sorted into three kinds. Krishna gives the headline before the breakdown. The happiness worth having is the one reached abhyasat, by practice, sustained effort over time, and the one in which duhkha-anta nigacchati, the end of sorrow is arrived at. This is the working definition. Real happiness is not stimulation, not arrival at a peak, not the relief of acquiring. It is a steady state where the gnaw of dissatisfaction quietly ends. The next three verses tell which sukha actually delivers this and which only seems to.