It has become part of the accepted wisdom to say that the twentieth century was the century of physics and the twenty-first century will be the century of biology.
Because the twentieth century was a century of violence, let us make the twenty-first a century of dialogue.
Twenty-first century medicine must not be confined to a twentieth-century bureaucracy.
exile ... might be the largest new state created by the twentieth century and the psychology of the twenty-first century.
America's business problem is that it is entering the twenty-first century with companies designed during the nineteenth century to work well in the twentieth.
The twentieth century was about getting around. The twenty-first century will be about staying in a place worth staying in.
It is my belief that whereas the twentieth century has been a century of war and untold suffering, the twenty-first century should be one of peace and dialogue. As the continued advances in information technology make our world a truly global village, I believe there will come a time when war and armed conflict will be considered an outdated and obsolete method of settling differences among nations and communities.
No one yet knows what awaits the Jews in the twenty-first century, but we must make every effort to ensure that it is better than what befell them in the twentieth, the century of the Holocaust.
If the end of the twentieth century can be characterized by futurism, the twenty-first can be defined by presentism.
Baseball is a nineteenth-century pastoral game. Football is a twentieth-century technological struggle.
History will remember the twentieth century for two technological developments: atomic energy and space flight.
'In the nineteenth century, we beat the British more than once,' Afghans often told me. 'In the twentieth century, we beat the Russians. In the twenty-first, if we have to, we'll beat the Americans!'
Game design isn’t just a technological craft. It’s a twenty-first-century way of thinking and leading.
The history of the twentieth century was dominated by the struggle against totalitarian systems of state power. The twenty-first will no doubt be marked by a struggle to curtail excessive corporate power.
The humanities and science are not in inherent conflict but have become separated in the twentieth century. Now their essential unity must be re-emphasized, so that twentieth-century multiplicity may become twentieth-century unity.
The greatest achievements in the science of this [twentieth] century are themselves the sources of more puzzlement than human beings have ever experienced. Indeed, it is likely that the twentieth century will be looked back at as the time when science provided the first close glimpse of the profundity of human ignorance. We have not reached solutions; we have only begun to discover how to ask questions.