Bhagavad Gita · Chapter 6: The Path of Meditation
Bhagavad Gita 6.27
प्रशान्तमनसं ह्येनं योगिनं सुखमुत्तमम् ।
उपैति शान्तरजसं ब्रह्मभूतमकल्मषम् ॥
praśāntamanasaṃ hyenaṃ yoginaṃ sukhamuttamam | upaiti śāntarajasaṃ brahmabhūtamakalmaṣam ||
The highest happiness comes to the yogi whose mind is at peace, whose passion has grown quiet, who is free from impurity and has become one with Brahman.
Modern context
Notice the verb: the highest happiness comes to the yogi. It is not seized or manufactured. Rajas, the restless, driving quality, has grown quiet, and in the quiet, happiness arrives on its own. This reverses the usual approach, in which we chase happiness with ever more activity. Here the chasing is what kept it away, and when the chase stops, happiness is found to have been nearby all along.