Shiva Purana
वह्निगतं भ्रूमध्ये प्रकाशते यस्त्वतंद्रितो योगी ॥ दीपहीनध्वांत पश्येन्न्यूनमसंशयं लोके ॥ १७ ॥
The Yogin who illuminates the fire existing between the eyebrows, alertfully can see in darkness without lamps to be sure.
english translation
vahnigataM bhrUmadhye prakAzate yastvataMdrito yogI ॥ dIpahInadhvAMta pazyennyUnamasaMzayaM loke ॥ 17 ॥
hk transliteration by Sanscript