Page:Posthumous Works of Mary Wollstonecraft Vol4.djvu/139

Rh never curved; or there is an affectation of candour that destroys all strength of character, by blending truth and falshood into an unmeaning mass. The mouth, in fact, seems to be the feature where you may trace every kind of dissimulation, from the simper of vanity, to the fixed smile of the designing villain. Perhaps, the modulations of the voice will still more quickly give a key to the character than even the turns of the mouth, or the words that issue from it; often do the tones of unpractised dissemblers give the lie to their assertions. Many people never speak in an unnatural voice, but when they are insincere: the phrases not corresponding with the dictates of the heart, have nothing to keep them in tune. In the course of an argument however, you may easily discover whether vanity or conviction stimulates