Happiness = Your biological happiness set point (50%) + Environmental conditions (10%) + Voluntary actions and daily choices (40%)

This is only a theory, but Seligman explains how our automatic happiness set point is dictated by our genes and controls base line happiness 50% of the time. Conditions of living affect our happiness of 10% of the time, but what we consciously choose to every day, the actions we perform, dictate 40% of our happiness.

Theory by Martin Seligman