The pride of the intellect: The intellect is the most incredible human capacity. It is the highest of all human capacities, actually. However, it is also the thing that can go most terribly wrong, because the intellect can become arrogant about its own existence and its accomplishments, and it can fall in love with its own products. That's what happens with ideologies. You become obsessed with a human-constructed dogma of which you believe is 100% right, and it eradicates the necessity of anything transcendent.