When you walk through that door of opportunity you don't slam it shut behind you.

I come here today as a Christian, a person of faith who believes we've all been called to serve our fellow men and women and to honor God's creation. We want our girls to know right from wrong, to always tell the truth, to treat people no matter who they are with dignity and respect, no matter how different they may seem...because we want our girls to know we are all God's children and there's so much more that unites than divides us.

Sometimes the issue is about whether families and communities think girls are even worthy of an education in the first place. It's about whether girls are valued only for their labor and reproductive capacities or for their minds as well. And it's about whether women are viewed as second-class citizens or as full human beings entitled to the same rights and opportunities as men.

One thing that I've learned from male role models is that they don't hesitate to invest in themselves, with the view that, if I'm healthy and happy, I'm going to be a better support to my spouse and children. And I've found that to be the case: Once my kids were settled, the next thing I did was take care of my own health and sanity. And made sure that I was exercising and felt good about myself. I'd bring that energy to everything else that I did, the career, relationship, on and on and on.

People are always going to have opinions, and people have a right to their opinions.

You see, even though back then Barack was a Senator and a presidential candidate... to me, he was still the guy who'd picked me up for our dates in a car that was so rusted out, I could actually see the pavement going by through a hole in the passenger side door... he was the guy whose proudest possession was a coffee table he'd found in a dumpster, and whose only pair of decent shoes was half a size too small.

I've always tried to make sure that what I do really connects with the broader agenda of what my husband Barack Obama is trying to do.... But I also find that I have to be very passionate myself about the issue to be able to represent it well. One of the big issues that I've talked a lot about...is childhood health, nutrition and obesity.