Sarva Mangala Mangalye
Sanskrit. From the Devi Mahatmya, chapter 11 (the Narayani Stuti, the gods' hymn after the defeat of Shumbha); in the Markandeya Purana text on Sanskrit Wikisource it is numbered 91.9. The same verse also appears in the Devi Bhagavata Purana and the Bhavishya Purana..
One of the most widely used short prayers to the Goddess: said at the start or close of worship, at the end of an aarti, and on auspicious occasions.
verse
सर्वमङ्गलमाङ्गल्ये शिवे सर्वार्थसाधिके । शरण्ये त्र्यम्बके गौरि नारायणि नमोऽस्तु ते ॥
sarvamaṅgalamāṅgalye śive sarvārthasādhike | śaraṇye tryambake gauri nārāyaṇi namo'stu te ||
You are the blessing within every blessing, the kind and auspicious one who brings every aim to fulfilment. Refuge of all, three-eyed one, Gauri, Narayani: I bow to you.
Variants: No differences in wording between the sources checked.
The meaning is our own plain-English rendering. Wording varies a little between families and regions.