An extremely popular [1960's] [hippie] saying that was made ubiquitously famous by the one-of-a-kind, extremely esoteric and eventually iconic [comic strips] and books which appeared and evolved from within the exquisitely unique mind of the mad-genius cartoonist [R. Crumb]. These three simple words of [encouragement] reinforced the then-prevailing idea that people should be able to feel confident about [staying true] to their own chosen life path and not allowing the outside world to get them down or force them to change who they wanted to be.
> "Whether or not that peace march you're going on does anything to stop the war or not, just [remember] to keep on truckin'!"