Oh, most people I know have great wisdom to impart, and indeed, their words I do take to heart. Don't fret too much then that you yourself fail in that part. Nothing personal.
And while your at it, whipe[sic] those lip-marks off your mirror.
IMHO, you should be more concerned as to why your wife's lip marks are all over other men's mirrors and boxer shorts rather than the clarity of said looking glasses.