God established that three of His seven commanded appointed times (feast days) – First Fruits, Pentecost, and Tabernacles – would be associated with two different grain harvests and one fruit of the vine harvest that took place annually in Israel. Moreover, God established that these three crops (barley, wheat, and grapes) would also depict, spiritually speaking, three classes of people. The Barley represents the holy and saintly overcomers, the Wheat represents the carnal believers, and the Grapes mostly represent the unsaved unbelievers.
Too many professed believers in Christ are resting on their laurels—are living like they are satisfied with their past achievement (salvation), so much so that they refuse to consider additional effort from them is necessary. They have assumed that their salvation automatically made them the Bride of Christ—made them saintly Overcomers. As a result, they either overlooked the Scripture that commands them to work out their own salvation, or they read and studied said Scripture but concluded it does not pertain to them.