Why is there suffering in the world?

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Death enters the world (Wisdom 1.13)
The selling of the birthright (Genesis 25.23)
The two worlds of the Bible (2nd Esdras 6.8)
The prospering of the heathen (2nd Esdras 6.55)
Israel's portion (2nd Esdras 7.10)
The appearing of the most High (2nd Esdras 7.31)
The wheat and the tares (Matthew 13.27)
The perishing of the multitude (2nd Esdras 9.20)