Happiness is about the pleasure-purpose principle over time. Each day, you have a bank account with 1440 minutes in it. And each day that account goes back to zero again, with no borrowing or saving. Just as you cannot recover time that is lost, you cannot recover happiness that is lost. Lost happiness is lost forever.
Happiness is determined by how you allocate your resources. Withdraw attention from negative. Attend to positive. Happiness is caused by what we pay attention to.
What you feel is determined by what happens to you but also by the type of person you are.
Some generally negative emotions can in fact sometimes be positive if they serve a purpose.
Much of what we do is driven by the opportunity to do so.
The production process of happiness is how you allocate your attention. Many of the assumptions we make about happiness and about ourselves have a lot to do with the fact that we generally pay more attention to what we think should make us happy rather than focusing on what actually does. The same life events and circumstances can affect you happiness a lot or a little depending on how much attention you pay to them.
Your attention is a scarce resource. You must ration it, since attention devoted to one thing is, by definition, attention that is not devoted to another. Attend to one thing and you pay by not being able to attend to something else. The key to being happy is to pay more attention to what makes you happy and less attention to what does not. This is NOT the same to paying attention to happiness itself.
When we attend to one aspect of our environment, we do not attend to others. This can lead to situational blindness, whereby you are so focused on one aspect of your environment that you fail to notice the bigger picture.
It is better for your happiness if you have modest expectations.
Regrets are far from straightforward. We are more likely to regret not doing something than having done it, especially if we are presented with the opportunity to make a big life change.
Stop doing the things that make you miserable. Change what you do, not how you think. You are what you do, your happiness is what you attend to, and you should attend to what makes you and those who you care about happy. Future happiness cannot compensate for current misery. Lost happiness is lost forever.