If you look at history, even recent history, you see that there is indeed progress. … Over time, the cycle is clearly, generally upwards. And it doesn't happen by laws of nature. And it doesn't happen by social laws. … It happens as a result of hard work by dedicated people who are willing to look at problems honestly, to look at them without illusions, and to go to work chipping away at them, with no guarantee of success — in fact, with a need for a rather high tolerance for failure along the way, and plenty of disappointments.