Shiva Purana
तस्मात्सह तथा शक्त्या हृदि पश्यंति ये शिवम् ॥ तेषां शाश्वतिकी शांतिर्नैतरेषामिति श्रुतिः ॥ २० ॥
The Vedas declare that only those have permanent peace who see Śiva in their hearts along with that Śakti and none of the others.
english translation
tasmAtsaha tathA zaktyA hRdi pazyaMti ye zivam ॥ teSAM zAzvatikI zAMtirnaitareSAmiti zrutiH ॥ 20 ॥
hk transliteration by Sanscript