Every difficulty in your life builds up your mental library of what it's like to go through hard times. And every mistake enables you to empathize with others who also make mistakes. And every time you become frustrated or angry, you gain a better understanding of others who feel this way.

Make note of all your worries and your fears. Make note of your uncomfortable or embarrassing moments. These -- together with every injury, illness, and wound -- help you to become more sensitive to the suffering of others.