constituted a critical lapse in judgement and a personal failure on my part for which I am solely responsable

It is dangerously destabilizing to have half the world on the cutting edge of technology while the other half struggles on the bare edge of survival.

Our overriding environmental challenge tonight is the worldwide problem of climate change, global warming, the gathering crisis that requires worldwide action.

I always get nervous when people start talking about legacies.

When I was in England, I experimented with marijuana a time or two, and I didn’t like it, and I didn’t inhale, and I never tried again.

Cooperation will save the future. And America should lead it. Every time humanity has been in danger of extinguishing itself, our consciousness and our conscience have led us to come together. That's the big issue of the 21st century.

The power of our example is more important than the strength of our military.