Now we come to the last life bucket, which by no means is the least. In fact, this bucket has an impact that goes well beyond your own life and your immediate circle of family and friends. This bucket is how, in big and small ways, you can help change the world.

For some people, making a difference is a strong motivation in their lives. Perhaps service to others is important in their families, and they have been volunteering in the community and for charity projects since they were young. This is certainly true of many purpose-driven millennials today. When I was a student at Kellogg many years ago, no more than 5 percent of my classmates were involved with nonprofit organizations or charitable work in any way. Today it's the opposite. More than 90 percent of current Kellogg students are active in nonprofits and philanthropy. Some volunteer with charities and service organizations—among them is Kellogg Cares, which focuses on meaningful service opportunities in the local community. Other Kellogg students are pursuing a career in the nonprofit sector and are highly motivated to put their MBA degrees to work in addressing major societal issues.

Other people, though, are not involved in volunteering, charitable work, or socially responsible activities. No shame or judgment here—just an invitation to think about what each of us can do.

I've found that the desire to make a difference is one of those wake-up calls that many of us ...

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