One of the things that happens when we're feeling more love and care is that we go into what's called "heart rhythm coherence," which you can actually measure and monitor on a computer screen. It's also possible to train yourself to go into heart rhythm coherence at will.

HeartMath found that five minutes of feeling love and care can strengthen your immune system for up to six hours, whereas five minutes of feeling angry can weaken and suppress the immune system for six hours. Love releases very powerful, beneficial chemicals into the body.

Bring happiness to your everyday experiences rather than try to extract happiness from them and however life looks, you'll be happy.

I interviewed 100 happy people - I call them my Happy 100 - and I learned amazing ideas and techniques from them that I began integrating into my life. I put them into practice - and they worked! I went from a D+ in happiness to an A-.

The sixth doorway is the Doorway of Vision. This relates to seeing with the eyes of love and corresponds to the energy center located in the third eye area of our forehead. When this doorway is open, we're more able to see life through love instead of differences.

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.

Love is your job description - no matter what you do for a living. If you ever feel unsure of what you're supposed to do in a situation, here's a good rule of thumb: always do what leads to greater love.