Shiva Purana
अलब्धालब्ध एवेह कोटिकोटिगुणाधिकः ॥ तस्माल्लब्ध्वैव मां देवि मन्त्रेणानेन पूजयेत् ॥ १८ ॥
What is not obtained is more than millions of times more than what is obtained. Therefore, O Devi, having obtained Me, one should worship Me with this mantra.
english translation
alabdhAlabdha eveha koTikoTiguNAdhikaH ॥ tasmAllabdhvaiva mAM devi mantreNAnena pUjayet ॥ 18 ॥
hk transliteration by Sanscript