Coextensive expressions with different intensions cannot in general be substituted for one another within an expression e while preserving the extension of e (assuming that the extension of a declarative sentence is its truth value).
What the history of language in general teaches, that in course of time, there is less change in form than signification, in grammar than lexicography, is true of the Greek.
Fer, as the poit sez, me 'eart 'as got / The pip wiv yearnin' fer - I dunno wot.
When we allowed gentlehood to be destroyed, gentle manners, honour, dignity, and such old virtues went too.
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