There's a beautiful forgiveness practice I love which is quite simple. It's called "Ho'oponopono" (pronounced: ho-o-pono-pono) and it's a lot easier to do than it is to say. It's a Kahuna Hawaiian technique, which involves repeating four phrases internally toward yourself or the person whom you're having a hard time forgiving.

When we're feeling fully alive, we're able to fully feel love. This doorway also relates to feeling our feelings fully. Not suppressing our feelings of anger, sadness or grief but allowing them to be felt. What's amazing is that when those feelings are felt, they actually dissolve into love.

When you forgive, you heal your own anger and hurt and are able to let love lead again. It's like spring cleaning for your heart.

The third doorway is the Doorway of Unconditional Self-love, which corresponds to the energy center located in the solar plexus area. As I said earlier, the key to feeling love and living in love is having self-love. I mean real unconditional self-love, not "I love myself because I'm a good wife" or "I love myself because I do a good job at work" or "I love myself because I look a particular way." It's because I love myself no matter what. That's where our real power lies, in the ability to love ourselves unconditionally.

If you think about the times in life when you've been the most deeply fulfilled, they're the times that you've felt love. Whether it's watching a sunset, spending time with a pet or being with a partner with whom you feel an intensely deep connection.

Like your weight set-point, which keeps the scale hovering around the same number, your happiness set-point will remain the same unless you make a concerted effort to change it.

In an experiment by Dr. Robert Emmons at the University of California–Davis, people who kept a ‘gratitude journal,’ a weekly record of things they felt grateful for, enjoyed better physical health, were more optimistic, exercised more regularly, and described themselves as happier than a control group who didn’t keep journals.