Shiva Purana
यश्चैकमनसा नित्यं तुंकारं ब्रह्मरूपिणम् ॥ किमसाध्यं न तस्यापि यथामति वरानने ॥ ५२॥
And he who with one mind always chants the tunkara in the form of Brahman. What is impossible for him even as he thinks, O beautiful one?
english translation
yazcaikamanasA nityaM tuMkAraM brahmarUpiNam ॥ kimasAdhyaM na tasyApi yathAmati varAnane ॥ 52॥
hk transliteration by Sanscript