Shiva Purana
सूक्ष्मा चिन्तामयी प्रोक्ता चिंतया रहिता परा ॥ या शक्तिः सा परा शक्तिश्शिवतत्त्वसमाश्रया ॥ ५ ॥
The subtle form of anxiety is described as the transcendental form devoid of anxiety. That power which is the supreme power is the shelter of the essence of Lord Śiva.
english translation
sUkSmA cintAmayI proktA ciMtayA rahitA parA ॥ yA zaktiH sA parA zaktizzivatattvasamAzrayA ॥ 5 ॥
hk transliteration by Sanscript