What we know from lab studies is that it's never too late to break a habit. Habits are malleable throughout your entire life. But we also know that the best way to change a habit is to understand its structure - that once you tell people about the cue and the reward and you force them to recognize what those factors are in a behavior, it becomes much, much easier to change.

Our scientists grapple with the difficulties of placing a man on the moon, but the immediately troubling concern of our society is whether men of different races can sit together at a lunch counter.

We do not succeed in changing things according to our desire, but gradually our desire changes. The situation that we hoped to change because it was intolerable becomes unimportant. We have not managed to surmount the obstacle, as we were absolutely determined to do, but life has taken us round it, led us past it, and then if we turn round to gaze at the remote past, we can barely catch sight of it, so imperceptible has it become.

We must think differently, look at things in a different way. Peace requires a world of new concepts, new definitions.

We need an energy revolution by breaking our dependence on fossil fuels, polluting fuels... I am very, very confident our small state will lead this. We will be noticed by the country and the world.

I couldn't have imagined that I would live long enough to see Egypt emancipated from decades of repression.