One thing we know for sure is that change is certain, progress is not.

Fail to plan, plan to fail.

From the theft of confidential cables to 21st century protest movements, to development breakthroughs that have the potential to change millions of lives, we are all in uncharted territory.

I take running for president and being president really seriously. It's a - maybe the toughest job in the world, right? And I knew that there was unfinished business from the successful two terms of President Obama, whom I had served, but that we needed to go further on the economy, on health care, and so much else.

In an excess of examples, the walk to globalization has additionally implied the minimization of women and young ladies. What's more that must change.

That is the number-one threat we face in the world. And it becomes particularly threatening if terrorists ever get their hands on any nuclear material. So a man who can be provoked by a tweet should not have his fingers anywhere near the nuclear codes, as far as I think anyone with any sense about this should be concerned.

I am a fan of the social policies that you find in Europe