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The means by which the sublime is produced are chiefly three: the passion of terror, the passion of astonishment, and certain modes of greatness, which excite in us, by their very magnitude, an idea of our own nothingness. The passion of terror, when it is excited in a timid soul, is the most powerful source of the sublime; and it is often by the appearance of danger, though not always attended with real danger, that the strongest emotions are raised.