Humans need to feel effective - to feel that we can "make a dent," as he puts it. So the art of living is to find expressions appropriate to our own uniqueness in which we can experience effectiveness.

I get goose-bumps when you talk about Diane Wilson. Who knows where she found that courage? When she was a child, she would crawl under the bed when a stranger came to the house. But in 1989, she found out that her county in south Texas was ranked worst in the country for toxic waste. She wondered if the effluent, dumped into the waters where she and her family had shrimped for generations, might be responsible for the dwindling fish populations. And she suspected that her son's autism might be related to the pollution.

In the late 1960s, there were alarming predictions that worldwide famine was around the corner. I wondered if humans had already lost the race, overrun the Earth's capacity. I let one question lead to the next, and unearthed information that would forever change my life: Not only is there enough food in the world to feed every man, woman, and child on Earth, there is enough to make us all chubby.

We'll learn fear might not mean 'stop'; personally, I've come to believe fear usually means 'go.' It always means listen closely.

Science is showing us that we are even more connected to each other than we ever realized.

Honest hope has an edge. It's messy. It requires that we let go of all pat answers, all preconceived formulas, all confidence that our sailing will be smooth. It's not a resting point. Honest hope is movement.

The good life for me always meant connecting with those big, important issues that grown-ups get so excited about.