Science is based on experiment, on a willingness to challenge old dogma, on an openness to see the universe as it really is. Accordingly, science sometimes requires courage - at the very least the courage to question the conventional wisdom.
Courage is resistance to fear, mastery of fear - not absence of fear. So many look to eradicate fear from their lives, when that is an impossible task. You can certainly experience moments in absence of fear, however accept that fear will be with you whenever you are in the process of living creatively. The challenge is to go ahead regardless, simply notice the feeling and manage being courageous.
Well, I think that when you think about the challenges we face, these are challenges that require us to look forward and not backwards. When it comes to the economy I think we have to recognize that we are now in a global economy. And that the measure of our success is: how well are we training our workers? How well are we investing in the new energy economy?
I always want to set myself a challenge by doing something no-one would expect me to do! But, having said that, I don't feel as a musician you can steer too far away from what you normally do.
As a matter of fact, it's in our interests that we help reformers across the Middle East achieve their objectives. This is the fundamental challenge of the 21st century.
The knowledge which we seek, the answers for which we yearn, and the strength which we desire today to meet the challenges of a complex and changing world can be ours when we willingly obey the Lord’s commandments.
Whenever I look at the history of presidents I deeply admire - the one thing that I'm always struck by is persistence. It's a quality that's underrated. Being able to plough through, being able to stay buoyant in the face of challenges.
Writing is something that you can never do as well as it can be done. It is a perpetual challenge and it is more difficult than anything else that I have ever done.
We'll continue to speak out in a respectful way; never challenging somebody's love for America when you criticize their strategies or their point of view.
So long as I'm the president, we will. I clearly see the challenge. I see the challenge of what these threats pose to our homeland, and I see the challenge of what these threats pose to the world.