Open your arms to change but don't let go of your values. - Tenzin Gyatso

If you wish to experience peace, provide peace for another.
If you wish to know that you are safe, cause another to know that they are safe.
If you wish to better understand seemingly incomprehensible things, help another to better understand.
If you wish to heal your own sadness or anger, seek to heal the sadness or anger of another.

happiness is determined more by one’s state of mind than by external events.

I think that the scientists are right. People who are always laughing have a sense of abandon and ease. They are less likely to have a heart attack than those people who are really serious and who have difficulty connecting with other people. Those serious people are in real danger.