Isaiah 26:3-4 KJV
[3] Thou wilt keep him in perfect peace, whose mind is stayed on thee: because he trusteth in thee. [4] Trust ye in the LORD for ever: for in the LORD JEHOVAH is everlasting strength:
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Romans 8:28 KJV
[28] And we know that all things work together for good to them that love God, to them who are the called according to his purpose.
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The wheat represents those who are truly repentant, the chaff those like the Pharisees and Sadducees who are not. The messiah will clear the world, and those that are worthy would be brought into his "barn" while those that were unworthy will burn in unquenchable fire.