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“…there is a particular boldness in metaphor, which is not to be found in the same degree in any of the figures of rhetoric. Without any thing like an explicit comparison, and commonly without any warning or apology, the name of one thing is obtruded upon us, for the name of another quite different, though resembling in some quality. The consequence of this is, that as there is always in this trope an apparent at least, if it cannot be called a real impropriety, and some degree of obscurity, a new metaphor is rarely to be risked.” — George Campbell
…there is a particular boldness in metaphor, which is not to be found in the same degree in any of the figures of rhetoric. Without any thing like an explicit comparison, and commonly without any warning or apology, the name of one thing is obtruded upon us, for the name of another quite different, though resembling in some quality. The consequence of this is, that as there is always in this trope an apparent at least, if it cannot be called a real impropriety, and some degree of obscurity, a new metaphor is rarely to be risked.