Doctrine and Covenants 93:

31) Behold, here is the agency of man, and here is the condemnation of man; because that which was from the beginning is plainly manifest unto them, and they receive not the light.

32) And every man whose spirit receiveth not the light is under condemnation.

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39) And that wicked one cometh and taketh away light and truth, through disobedience, from the children of men, and because of the tradition of their fathers.