Courage is the most important of all the virtues, because without courage you can't practice any other virtue consistently. You can practice any virtue erratically, but nothing consistently without courage.
What you focus on expands, and when you focus on the goodness in your life, you create more of it. Opportunities, relationships, even money flowed my way when I learned to be grateful no matter what happened in my life.
And lastly from that period I remember riding in a taxi one afternoon between very tall buildings under a mauve and rosy sky; I began to bawl because I had everything I wanted and knew I would never be so happy again.
Gilbert White discovered the formula for complete happiness, but he died before making the announcement, leaving it for me to do so. It is to be very busy with the unimportant.