So carry your courage in an easily accessible place, the way you do your cellphone or your wallet. You may still falter or fail, but you always know that you pushed hard and aimed high. Take a leap of faith. Fear not. Courage is the ultimate career move.

Today is the only guarantee you get.

One of the things that got me on this topic for this book was that when I was researching the column I wrote in 2009 saying that I was stepping down from my column at "Newsweek" because I wanted to make room for newer, fresh voices out there, I discovered that in the year I was born, 1952, the average life expectancy of an American was 68. I was shocked by that figure and every time I mention it I hear a gasp from somebody in the crowd. Now, of course, we're more or less at 80, so that means that we've gotten 12 additional years.

But while ignorance can make you insensitive, familiarity can also numb. Entering the second half-century of an information age, our cumulative knowledge has changed the level of what appalls, what stuns, what shocks.

Some of the most important lessons I've learned have been from stumbling, and I am deeply grateful that my parents allowed me to fight my own battles.

Acts of bravery don't always take place on battlefields. They can take place in your heart, when you have the courage to honor your character, your intellect, your inclinations, and yes, your soul by listening to its clean, clear voice of direction instead of following the muddied messages of a timid world.

You cannot be really first-rate at your work if your work is all you are.