I think your "warmth" is something between being positive or negative, while positive thinking is all about seeing the bright side in almost everything and belittle the bad things no matter how serious that they are, this can be absurd and unrealistic at a times, but negatively isn't a good choice either since it will cripple you and turn you into something unable to see the point in doing anything, between those two extremes "warmth" is about acknowledging the negative side while taking a positive attitude. 