Shiva Purana
विपर्यस्ता मतिर्या सा भ्रांतिरित्यभिधीयते ॥ दुःखमज्ञानजं पुंसां चित्तस्याध्यात्मिकं विदुः ॥ ६ ॥
That which is opposed to the mind is called illusion. It is understood that suffering caused by ignorance is the spiritual cause of the mind.
english translation
viparyastA matiryA sA bhrAMtirityabhidhIyate ॥ duHkhamajJAnajaM puMsAM cittasyAdhyAtmikaM viduH ॥ 6 ॥
hk transliteration by Sanscript