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(Nestor:) 'The will of the everlasting gods is not turned suddenly.' (3.147)
It's hard to change a god's mind—but it sounds like Nestor is suggesting that it can be changed. Maybe if you sacrifice enough ram thighs.
(Nestor:) ‘Never once did the wind fail, once the god had set it blowing.’ (3.182-183)
Nestor credits Menelaos’s safe journey home to the will of the Gods.
(Nestor:) 'Act quickly now, dear children, and do me this favor, so that I may propitiate first of all the gods, Athene, who came plainly to me at our happy feasting in the god's honor. Come then, let one man go to the field for a cow, so that she may come with all speed, and let one of the oxherds be driving her, and one go down to the black ship of great-hearted Telemachos, and bring back all his companions, leaving only two beside her, and yet another go tell the worker in gold Laerkes to come, so that he can cover the cow's horns with gold. You others stay here all together in a group but tell the serving women who are in the house to prepare a glorious dinner, and set chairs and firewood in readiness, and fetch bright water.' (3.418-429)
Want your sacrifice to net you bonus points? Cover its horns with gold, first. We're getting the idea that pleasing the gods means performing extravagant wasteful actions—and, bear with us for a minute, but wouldn't people who have the means to perform extravagant wasteful actions have a leg up in the first place?