Some Ans. Questions 2014 by -'Abdu'l-Bahá- 1 Para

In this material world, man is subject to the force of instinctual desires, of which sin is the inevitable consequence, for these desires are not bound by the laws of justice and righteousness. The body of man is a prisoner of nature and will act in accordance with whatsoever nature dictates. It follows that sins- such as wrathfulness, envy, contentiousness, greed, avarice, ignorance, rancour, corruption, pride, and cruelty- must exist in the material world. All these bestial attributes exist in the nature of man. A man who has been deprived of spiritual education is even as an animal, like those inhabitants of Africa whose actions, manners, and morals are purely instinctual and who act according to the dictates of nature, to the point of rending and eating one another. Thus it becomes evident that the material world of man is a world of sin, and that on this plane man is indistinguishable from the animal (29:5)

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