“Few would argue that a simpler consciousness, no matter how harmonious, is preferable to a more complex one. While we might admire the serenity of the lion in repose, the tribesman’s untroubled acceptance of his fate, or the child’s wholehearted involvement in the present, they cannot offer a model for resolving our predicament. The order based on innocence is now beyond our grasp. Once the fruit is plucked from the tree of knowledge, the way back to Eden is barred forever.”