Verse 30

अस्यास्त्वदर्शनं यत्तदविद्येत्युच्यते बुधैः ।अविद्या हि जगद्धेतुस्ततः सर्वं प्रवर्तते

In plain words

The not-seeing of this is what the wise call avidyā; for avidyā is the cause of the world, and from it everything proceeds.