यत्तदग्रे विषमिव परिणामेऽमृतोपमम्।
तत्सुखं सात्त्विकं प्रोक्तमात्मबुद्धिप्रसादजम्।।18.37।।
18.37 That which is like poison in the beginning, but comparable to nectar in the end, and which, arises from the purity of ones intellect-that joy is spoken of as born of sattva.
18.37 That pleasure, which at the beginning, i.e., at the time of beginning of Yoga, is like poison, i.e., is painful because it reires strenuous efforts and because the distinct nature of the self is not yet experienced, but which after long practice fructifies in the blissful experience of the self - that joy born of a serene state of mind focusing on the self is Sattvika. The Buddhi concerning the self is Atama-buddhi. When all objects are withdrawn from that Buddhi it becomes serene (Prasanna). The joy born of the experience of the self in its distinct nature, when all objects are withdrawn from the Buddhi, becomes like elixir. That joy is said to be Sattvika.
Yattadagre vishamiva parinaame’mritopamam; Tatsukham saattwikam proktam aatmabuddhiprasaadajam.
yat—which; tat—that; agre—at first; viṣham iva—like poison; pariṇāme—in the end; amṛita-upamam—like nectar; tat—that; sukham—happiness; sāttvikam—in the mode of goodness; proktam—is said to be; ātma-buddhi—situated in self-knowledge; prasāda-jam—generated by the pure intellect