Verse 33

यथा कीदृगवस्त्वेतदिति यावद्विकल्प्यते ।अविद्या क्षीयते तावदालोकेनान्धता यथा

In plain words

so, the moment one reflects, 'what sort of unreal thing is this?', avidyā wastes away -- as blindness does before light.