ORPHIC HYMN TO MNEMOSYNE

Mnemosyne is one of the most significant Goddesses in the Hellenic Pantheon. She is the Goddess of memory and the One that the initiates invoke, in order to help them gain knowledge and understanding of the sacred Mysteries. Moreover, she is the Mother of the Nine Muses. 

The following translation is by Thomas Taylor :

I invoke Mnemosyne, the consort of Jove Divine, Source of the Holy, sweet-speaking Nine; Free from the oblivion of the fallen mind, By whom the soul with intellect is joined; Reason's increase and thought, to Thee belong, All-powerful, Pleasant, Vigilant and Strong; 'Tis thine to waken from lethargic rest all thoughts deposited within the breast; And nought neglecting, Vigorous to excite the mental eye from dark oblivion's night. Come, Blessed Power, the mystic's memory wake to holy rites, and Lethe's fetters break. 

The video below includes the original hymn in ancient Greek. The invocation begins at 1.04.