किंचिदस्ति नकिंचिद्यच्चित्संविदिति तत्स्थितम् ।तदेवाविदिताभासं सदविद्येत्युदाहृतम्
In plain words
That which is something and is nothing -- that is established as cit, as saṃvid. That very thing, being unrecognized in its semblance, is called avidyā.