Verse 40

आद्यन्तयोरसद्रूपे नूनं परिहृते हृदा ।सर्वस्मिन्नेव यः शेषस्तमविद्याक्षयं विदुः

In plain words

When, by the heart, the form that is unreal at the beginning and the end is surely set aside, whatever remains in all things -- that they know as the destruction of avidyā.