We must wait for the official history of the Chinese Revolution to record in greater detail the invaluable work of our Japanese friends.

Of all the things we have done, the most important - the one that history will record as the principal contribution of our generation - is that we understand how to turn the armed struggle into a Revolution; that we realized that it was essential to create a new mentality to build a new society.

Humanity has experienced many revolutionary changes over the course of history: revolutions in agriculture, in science, industrial production, as well as numerous political revolutions. But these have all been limited to the external aspects of our individual and collective lives.

Simon Bolivar, when history led him - and as Karl Marx said, men can make history, but only as far as history allows us to do so - when history took Bolivar and made him the leader of the independence process in Venezuela, he made that process revolutionary.

Revolutions are the locomotives of history.

The revolutionary breakthrough will come with rockets that are fully and rapidly reusable. We will never conquer Mars unless we do that. It'll be too expensive. The American colonies would never have been pioneered if the ships that crossed the ocean hadn't been reusable.

It is impossible to predict the time and progress of revolution. It is governed by its own more or less mysterious laws.

No innovation in the past 200 years has done more to save lives and improve health than the sanitation revolution triggered by invention of the toilet. But it did not go far enough. It only reached one-third of the world.

The revolutionary sees his task as liberation not only of the oppressed but also of the oppressor. Happiness can never truly exist in a state of tension.

I have a great respect for incremental improvement, and I've done that sort of thing in my life, but I've always been attracted to the more revolutionary changes. I don't know why. Because they're harder. They're much more stressful emotionally. And you usually go through a period where everybody tells you that you've completely failed.

Passion is needed for any great work, and for the revolution, passion and audacity are required in big doses.

The real power of the Buddha was that he had so much love. He saw people trapped in their notions of small separate self, feeling guilty or proud of that self, and he offered revolutionary teachings that resounded like a lion's roar, like a great rising tide, helping people to wake up and break free from the prison of ignorance.

The true revolutionary is guided by a great feeling of love. It is impossible to think of a genuine revolutionary lacking this quality.

My long struggles as a soldier of the Chinese Revolution have forced me to realize the necessity of facing hard facts. There will be neither peace, nor hope, nor future for any of us unless we honestly aim at political, social and economic justice for all peoples of the world, great and small.

Technology is the future, I have seen the third industrial revolution, and we are in the midst of the fourth industrial revolution.

Fashions have done more harm than revolutions.

When the Taiwan Relations Act passed in 1979, our biggest concern was preventing the use of military force against Taiwan. Little did we know that our friends on Taiwan could so effectively use the space created by our friendship to revolutionize their political system.

What makes revolutionary thought unique is its clarity and dignity, and its clear grasp of freedom and justice: simple, clear words that are understood without the need for any help from elite writers or thinkers.

I was only a working-class boy from a Nationalist ghetto. But it is repression that creates the revolutionary spirit of freedom.

With the Industrial Revolution, the production of food was delegated to big companies in order for women and men to be in the labour force, to come home, stick something in the oven, and eat. It became a big industry that does not have a love affair with food nor is really concerned about nurturing you or giving you the right nutrition.

Low-cost, high-grade coal, oil and natural gas - the backbone of the Industrial Revolution - will be a distant memory by 2050. Much higher-cost remnants will still be available, but they will not be able to drive our growth, our population and, most critically, our food supply as before.

I have gone from a proponent of campaign finance reform to a revolutionary during my time in public service.

Looking back, it amuses me that people imagined that I was a very brash, fearless, redheaded young revolutionary when I was in fact a very insecure, mousy-haired, middle-aged man with a deep fear of authority.

A country that cannot feed itself cannot have self-pride, and in the mid-'60s 20 percent of all the wheat produced in America came into India. We were agriculturally a basket case. And 15 years later, 20 years later, we have become an agricultural power. This is the famous Green Revolution.