A glorification / final salvation / entrance into heaven, which is made contingent upon some [unmeasurable] presence of a "fruit of progressive sanctification", is, in the final analisis, a salvation by works. 

     That's all there's to it, folks. 

     This conundrum explains for incipient (and overt) hopeless legalism of those churches and individuals, which espouse this becoming "holier and holier by sinning less [noticeably than other people?]" notion. 

     {Not that I am against growing in the knowledge of grace and in practical obedience in all of our conversation. I am all FOR that}.