You can do several things to enjoy your life day-to-day. Positive psychology techniques of gratitude is generally a short-term solution.
More importantly is to optimize your environment so you're more likely to be happy long term.
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Academically speaking, happiness cannot be measured. It is really a mix of health, emotions, the way you evaluate your life, and the extent to which you live out your values.
While happiness can't be measured, you can measure life satisfaction by asking questions about how much you feel joy. You can measure people's sense of purpose by asking what new and interesting things they learn every day and if they used their strength to do what they do best.
Happiness can be thought of as a retirement portfolio. You want it balanced with short and long term investments.
Those in pursuit of purpose miss that there is value in the sum of positive emotions we experience every day. If you're only goal-oriented, you forgo today's joy for a perceived better future. But, chasing tomorrow might not give you the happiness you desire.
Even if you cannot change your broader environment, you can still do small things to create positive emotions.
Happiness is dependent on outside circumstances to align with your expectations so that the end result is your happiness. It’s based on internal and external circumstances, thus unstable, with its chronic lack leading to despair and depression.
Meanwhile, joy is internal and not contingent on anything in order to exist. It can be cultivated and the first step to do it is to understand the difference between happiness and joy.
Happiness is more like a place you occupy than an object you obtain. Some days you’ll be there and some days you wont, but the more time you spend thinking about being happy, the less likely you are to spend time being so.