You may want to prove that you're worthy of other kids or neighbors who were wealthier than you and teased you. You may want to prove that you're worthy of high expectations. But I do think that there is a youthful ambition that very much has to do with making your mark in the world. And I think that cuts across the experiences of a lot of people who end up achieving something significant in their field.

It's important to listen to what scientists have to say, even when it's inconvenient, especially when it's inconvenient

But today, just a few years into the twenty-first century, we already find ourselves in a different and precarious position. As revolutions in communications and technology have broken down barriers across the world, it has given more power to both our competitors and our enemies.

We built this country by making things, by producing goods we could sell.

I would not be running for President if I didn't believe with all my heart that this is what the vast majority of Americans want for this country. This union may never be perfect, but generation after generation has shown that it can always be perfected. And today, whenever I find myself feeling doubtful or cynical about this possibility, what gives me the most hope is the next generation - the young people whose attitudes and beliefs and openness to change have already made history in this election.

Nothing can stand in the way of the power of millions of voices calling for change.

Your kids grow up. I think they more than anything are making me feel as if, you know, you want to squeeze everything you got every single day out of this thing. Because it passes quick.