For me, this is one of the most amazing and empowering findings from positive psychology. Your intentional (self-determined) thoughts and perspectives are said to determine about 40% of your experience of happiness.  You have around 40% control over how an event is perceived and emotionally experienced.  You have significant choice over how you react to the weather, the view out of your window or anything else in your present moment.  How you frame or reframe the present moment is significant.  Do you just react to events unconsciously or do you deliberately set out to apply a certain mindset?

If around 40% of what determines your well-being is up to your intentional thoughts and activities, what about the rest?  50% is largely set by your genetically determined set points (your genes, which cannot be changed).  The last 10% is your unique life circumstances (rich or poor, healthy or unhealthy, beautiful or plain, live in amazing or poor housing, etc.).

So what does this 40% suggest?  You experience an event or action, but how you process and internally experience that situation is flexible.  You cannot change the weather, traffic conditions or world events but you do have a choice as to how you react to these circumstances.  Your job, relationships, health, wealth, home and education are largely fixed in the short run, but how you feel about these matters is 40% is up to you.  These circumstances can be framed negatively or that same moment can be painted as having glimmers of wonder, joy, empowerment, opportunity, excitement, optimism; you decide.

This 40% possibility does not negate that one’s present moment may have difficult, sad or unjust elements, but to ruminate and exclusively stay focused on the negative aspects can have troubling consequences.  There is much truth to the saying:

“Every cloud has a silver lining”

You just have to look for that sliver of hope, to be open to a small possibility of a positive outcome.  Call this possible thinking rather than positive thinking, finding at least one hopeful aspect of your present moment.

For further reading, if you are interested:

Pursuing Happiness: The Architecture of Sustainable Change, Sonja Lyubomirsky, Kennon M. Sheldon, David Schkade, Review of General Psychology 9(2):111-131 · June 2005

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