"The Mind very often sets it self on work in search of some hidden Idea, and turns, as it were, the Eye of the Soul upon it; though sometimes too they start up in our Minds of their own accord, and offer themselves to the Understanding; and very often are routed and tumbled out of their dark Cells, into open Day-light, by some turbulent and tempestuous Passion"

• John Locke, An Essay Concerning Human Understanding

An evocation of memory.

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