“Accentuate the positive” is more than a catchy cliche or song lyric. It is wisdom. It is therapeutic. It is self-actualizing. It contributes substantially to the foundation of one’s happiness and success.
A corollary of this: As best you can, turn every negative into a positive. As best you can, eliminate negative words from your vocabulary. Rather than saying “Don’t…”, find a way to express the same core message you desire by saying “Do…”. When we re-frame our messages in this way, they are more likely to be heard.