We hold ourselves back in ways both big and small, by lacking self-confidence, by not raising our hands, and by pulling back when we should be leaning in.

A truly equal world would be one where women ran half our countries and companies and men ran half our homes.

Social gains are never handed out. They must be seized.

I want to tell any young girl out there who's a geek, I was a really serious geek in high school. It works out. Study harder.

The more women help one another, the more we help ourselves. Acting like a coalition truly does produce results. Any coalition of support must also include men, many of whom care about gender inequality as much as women do.

My goal is very clear, and I wrote about it in Lean In, which is that women run half our companies and countries and men run half our homes. As much as I wish that could happen in four years, I don't think that's a likely time period. But I think it can happen sooner than we think. Part of it is having that aspiration and that goal. I think we too often suffer from the tyranny of low expectations.

It is the ultimate luxury to combine passion and contribution. It's also a very clear path to happiness.