Chapter 18 · Liberation through Renunciation · Krishna said
Bhagavad Gita 18.37 — Sattvic happiness
यत्तदग्रे विषमिव परिणामेऽमृतोपमम्। तत्सुखं सात्त्विकं प्रोक्तमात्मबुद्धिप्रसादजम् ॥
yattadagre viṣamiva pariṇāme'mṛtopamam | tatsukhaṃ sāttvikaṃ proktamātmabuddhiprasādajam ||
Meaning
That which feels like poison at first but becomes nectar in the end, and arises from the clarity of one's own mind, is called sattvic happiness.