Shiva Purana
अयथाबुद्धिरर्थेषु बहुधा भ्रांतिरुच्यते ॥ यथार्थाकारसंवित्तिर्विद्येति परिकीर्त्यते ॥ ८ ॥
Delusion usually means Ayathābuddhi (not knowing as it is) in regard to the objects. Vidyā is opposite to it where the knowledge is in the true form.
english translation
ayathAbuddhirartheSu bahudhA bhrAMtirucyate ॥ yathArthAkArasaMvittirvidyeti parikIrtyate ॥ 8 ॥
hk transliteration by Sanscript