A debility and dimness of the imaginative power, and a consequent necessity of reliance on the immediate impressions of the senses, do, we know well, render the mind liable to superstition and fanaticism. Having a deficient portion of internal and proper warmth, minds of this class seek in the crowd circum fana for a warmth in common, which they do not possess singly. Cold and phlegmatic in their own nature, like damp hay, they heat and inflame by co-acervation; or like bees they become restless and irritable through the increased temperature of collected multitudes. Hence the German word for fanaticism, (such at least was its original import,) is derived from the swarming of bees, namely, schwaermen, schwaermerey. The passion being in an inverse proportion to the insight,--that the more vivid, as this the less distinct--anger is the inevitable consequence. The absense of all foundation within their own minds for that, which they yet believe both true and indispensable to their safety and happiness, cannot but produce an uneasy state of feeling, an involuntary sense of fear from which nature has no means of rescuing herself but by anger. Experience informs us that the first defence of weak minds is to recriminate.
--Samuel Taylor Coleridge, Biographia Literaria, Chapter 2. That last sentence strikes with special force; and is worth keeping in mind in our day-to-day life.