The Empirical Manifesto

From Trust: Human Risk Management:

Trust is believing that the person who is trusted will do what is expected; Success results in feelings of security, trust, and optimism.

And from Interdependence:

Optimists explain positive events as having happened because of them (internal). They also see them as evidence that more positive things will happen in the future (stable), and in other areas of their lives (global). Conversely, they see negative events as not being their fault (external). They also see them as being flukes (isolated) that have nothing to do with other areas of their lives or future events (local). Understandably, if you’re an optimist, this bodes well for your future. Negative events are more likely to roll off of your back, but positive events affirm your belief in yourself, your ability to make good things happen now and in the future, and in the goodness of life.

Optimists are often perceived as happy, bubbly people with too much energy, while pessimists are generally portrayed as slower, gruffer, and more melancholic. From a physics perspective, all those bubbles and all that energy of optimists would seemingly translate as being the molecular equivalent of hot water, while the inverse could be said of pessimists and the slower movement of cold water - seriously, its a fun analogy!

But my point is this. The Second Law of Thermodynamics loosely states that when the two meet, heat always flows spontaneously from hotter to colder regions of matter. So were say, an optimist and a pessimist to start a relationship with one another, optimism will always flow spontaneously to the pessimist, and never the other way around :D