Verse
तत्र सत्त्वं निर्मलत्वात् प्रकाशकमनामयम् ।सुखसङ्गेन बध्नाति ज्ञानसङ्गेन चानघ ॥
Of these sattwa is by the purity of its quality a cause of light and illumination, and by virtue of that purity produces no disease or morbidity or suffering in the nature; it binds by attachment to knowledge and attachment to happiness, O sinless one.
Gītā 14·6