Verse 12

अविद्यासंपरिज्ञातमिदमेव महौषधम् ।अविद्याविततव्याधेस्तिमिरस्येव दीपकम्

In plain words

This very thing — avidyā fully known — is the great medicine for the disease that avidyā's own spreading has caused, like a lamp against darkness.