Poison first, nectar after
Bhagavad Gita 18.36-39The joy one grows into by practice, like poison first and nectar in the end, is born of a clear understanding of the self. Pleasure from the senses is nectar first and poison after. The pleasure of sleep, laziness and heedlessness deludes from start to finish.
- Krishna
सुखं त्विदानीं त्रिविधं श्रृणु मे भरतर्षभ । अभ्यासाद्रमते यत्र दुःखान्तं च निगच्छति ॥
sukhaṃ tvidānīṃ trividhaṃ śrṛṇu me bharatarṣabha | abhyāsādramate yatra duḥkhāntaṃ ca nigacchati ||
Now hear from me the three kinds of happiness, best of the Bharatas: the happiness one comes to enjoy through practice, and in which one reaches the end of sorrow.
- Krishna
यत्तदग्रे विषमिव परिणामेऽमृतोपमम् । तत्सुखं सात्त्विकं प्रोक्तमात्मबुद्धिप्रसादजम् ॥
yattadagre viṣamiva pariṇāme’mṛtopamam | tatsukhaṃ sāttvikaṃ proktamātmabuddhiprasādajam ||
That which is like poison at first and like nectar in the end, born from the clarity of one's own understanding, is called sattvic happiness.
- Krishna
विषयेन्द्रियसंयोगाद्यत्तदग्रेऽमृतोपमम् । परिणामे विषमिव तत्सुखं राजसं स्मृतम् ॥
viṣayendriyasaṃyogādyattadagre’mṛtopamam | pariṇāme viṣamiva tatsukhaṃ rājasaṃ smṛtam ||
The happiness that comes from contact of the senses with their objects, like nectar at first and like poison in the end, is called rajasic.