The title is a reference to lyrics from "The Battle Hymn of the Republic", by Julia Ward Howe (emphasis added):
Mine eyes have seen the glory of the coming of the Lord:
He is trampling out the vintage where the grapes of wrath are stored;
He hath loosed the fateful lightning of His terrible swift sword:
His truth is marching on.
These lyrics refer, in turn, to the biblical passage Revelation 14:19–20, an apocalyptic appeal to divine justice and deliverance from oppression in the final judgment. This and other biblical passages had inspired a long tradition of imagery of Christ in the winepress, in various media. The passage reads:
And the angel thrust in his sickle into the earth, and gathered the vine of the earth, and cast it into the great winepress of the wrath of God. And the winepress was trodden without the city, and blood came out of the winepress, even unto the horse bridles, by the space of a thousand and six hundred furlongs.
The phrase also appears at the end of Chapter 25 in Steinbeck's book, which describes the purposeful destruction of food to keep the price high:
[A]nd in the eyes of the hungry there is a growing wrath. In the souls of the people the grapes of wrath are filling and growing heavy, growing heavy for the vintage.
The image invoked by the title serves as a crucial symbol in the development of both the plot and the novel's greater thematic concerns: from the terrible winepress of Dust Bowl oppression will come terrible wrath but also the deliverance of workers through their cooperation. This is suggested but not realized within the novel.
Author's note
When preparing to write the novel, Steinbeck wrote: "I want to put a tag of shame on the greedy bastards who are responsible for this [the Great Depression and its effects]." He famously said, "I've done my damnedest to rip a reader's nerves to rags." His work won a large following among the working class, due to his sympathy for the migrants and workers' movement, and his accessible prose style.[14]
