Verse
सुखं त्विदानीं त्रिविधं शृणु मे भरतर्षभ ।अभ्यासाद्रमते यत्र दुःखान्तं च निगच्छति ॥
And now the threefold kinds of pleasure hear thou from Me, O bull of the Bharatas. That in which one by self-discipline rejoiceth and which putteth an end to pain; which at first is as poison but in the end is as nectar; that pleasure is said to be sattwic, born of the satisfaction of the higher mind and spirit.
Gītā 18·36