If you're truth seeking and practicing the golden rule, then a smile is a very rare thing in your interactions with people. To smile you must instead be conjuring a better world in your mind and trying to share some dim shadow of it, some dim shadow of your creativity. This other world... is actually not real. It is fake. The smile is fake. I suppose. Unless you cannot live without faith in it. Then you could believe this better world really exist and your conjuring of it, your attempt to share a tiny, dim, pitiful piece of it could be a positive sort of mysticism.
But if you go that far, as to need to truly believe it's real, to spend all your time focusing on it, that means you've given up on this world. That means you're either a pessimist (underneath that "fake" smile) or probably actually a realist... not that I plan on conceding that yet.
I had a phase where I was truthseeking and practicing the golden rule all the time.; being optimistic, being ridiculously idealistic. Appearing very down.
Perhaps some time can be spent conjuring some better world and trying to share a dim piece of it with others; some time smiling for no real good reason.
Perhaps some balance....
This is a more positive slant I suppose on the idealism versus realism previous post. Maybe.