In general, complete consistency across metaphors is rare; coherence, on the other hand, is typical.
==第十七章==
可速看
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The most important thing to bear in mind throughout our discussion of coherence is the role of purpose. A metaphorical structuring of a concept, say the JOURNEY metaphor for arguments, allows us to get a handle on one aspect of the concept. Thus a metaphor works when it satisfies a purpose, namely, understanding an aspect of the concept. When two metaphors successfully satisfy two purposes, then overlaps in the purposes will correspond to overlaps in the metaphors. Such overlaps, we claim, can be characterized in terms of shared metaphorical entailments and the cross-metaphorical correspondences established by them.