What a girl in the slums of Nairobi taught me about generosity — Let me tell you about a girl I know named Caroline. She lives in one of the most desperately poor areas of the world I have ever seen. It’s about an hour outside of Nairobi, Kenya.

I have a confession to make. There have been times in my career, especially early on, when I wasn’t as poised and in control as I wanted to be. Like the time I ran to the bathroom and cried, overwhelmed by impossible deadlines at a fast-paced advertising agency while suffering…