Infinite in mystery is the gift of the goddess
We seek it thus, and take to the sky
The gift of the goddess is a term used in Crisis Core -Final Fantasy VII-. It is frequently mentioned in the poem, LOVELESS. The poem calls it "the bringer of life," but offers no further explanation. Because the final chapter of LOVELESS is missing, nobody knows what happened to the world after receiving the Gift of the Goddess, although there are various interpretations and theories.
Near the end of the game, Genesis Rhapsodos begins to try and reenact the epic poem in his attempt to receive the Gift of the Goddess. After abandoning his plans to have Dr. Hollander create a cure for his degradation, he begins to hunt for the Gift of the Goddess, as he believes it will cure him.
You don't understand the beauty of these words. How tragic... I'm not surprised. Even I didn't understand all of it. The greatest mystery behind the gift of the goddess... "The water's surface." And the answer I have arrived at, is the lifestream.
Later, he claims he has found the gift of the goddess: a large tree growing in the Banora Underground, with the Goddess Materia on its perch. The Materia is seen absorbing the surrounding Lifestream and giving it to Genesis. Zack also theorizes that the Banora White is the gift of the goddess.
Crisis Core Complete Guide reveals that in Chapter 5, when Genesis learns he won't be able to cure his degradation with Hollander, he starts to work towards the reenactment of LOVELESS in order to gain the gift of the goddess. Genesis is trying to reenact the fourth chapter of LOVELESS when he faces Zack in the Banora Underground; the scene being the duel between friends with himself as "the hero", Zack as "the prisoner", the goddess statue as "the goddess", and the Red Materia as "the gift of the goddess".
Genesis does receive his "gift of the goddess" in the end. He comes to terms with not being "the hero" from LOVELESS, and after the Lifestream he had gained from the Goddess Materia leaves his body, his degradation is gone. The Crisis Core Complete Guide further reveals it was the accepting of the role of "the prisoner" that Genesis received the gift of the goddess, and therefore, it would be his "SOLDIER pride", the impetus for his shift of values, which was the gift of the goddess to Genesis. SOLDIER pride is a concept which symbolizes Angeal Hewley's will, so in a way it was Zack, who had inherited Angeal's will, who was the gift of the goddess for Genesis.