Look around at the hyperbolic and uncivil discourse between Democrats and Republicans, socialists and capitalists, Zionists and anti-Zionists, libertarians and liberals, the religious and the secular, pro-choice and anti-abortion: If you believe in anything completely — to the point of a rigorous purity — then you will at moments behave as an intellectual cripple. If you think any one ideology is greater than the potential of your own intellect and moral sense, you have likely impaired your ability to think and act honestly. If you can abide every all-encompassing cliche uttered on behalf of any single cause or argument, you are very likely poised to say, or do, something foolish, if not destructive.