I’m surprised at how fainthearted we sometimes are, and how quickly we lose courage.

No matter what the aggressor intends to do, when the world is truly united, it is then the world, not the aggressor, determines how events develop.

So the 20th century taught the world not to use nuclear weapons and not to proliferate. This is not a good strategy because recent history has shown that wars could erupt with equal devastation.

In the past, human progress had to come at the cost of the environment. If we wanted energy, we had to burn wood or we had to burn fossil fuels. If we wanted to grow more food, we had to expand farmland, often at the cost of forests. But technology and innovation means we're very quickly decoupling these impacts, such that this conflict is no longer true.

[Angela Merkel] showed what can be achieved when politicians take the right course of action and work to find solutions to the world’s challenges rather than simply shift responsibility to others.

The hour has come for a new generation to lead the Democratic Congress that I so deeply respect.

If you don't know what you're living for, you haven't yet lived.

To say you have no choice is to relieve yourself of responsibility.

There’s an interesting trend that occurs in times of mounting pressure and high uncertainty, which is that it’s a natural human tendency to seek out people that agree with us, that are similar to us because it’s a source of comfort in a world that’s so rapidly changing.