The Value of Lying

Perhaps when defined as 'deliberately uttering a falsehood for the purpose of taking advantage', Lying can easily be classified as 'Evil'.  However, even with that specification, Plato and Nietzsche might still disagree with the valuation, e. g. in cases in which they justify a Lie as for some greater good, i. e. that of the state, or that of a superior being, respectively.  Still, neither of those judgments recognizes the characteristic of Lying that is the source of its potential positive value.  For, the very possibility of Lying is derived from the essential conventionality of any 'Language', i. e. any system of commonly-accepted signals, an origin that gets obscured in dogmatic rhetoric that oppresses or mystifies.  In other words, Lying is a reminder that the value of any utterance is, like that of any tool, a function of that of the purpose to which it is put.