Sometimes its difficult to accept, to recognise ones own mistakes, but one must do it. I was guilty of overconfidence and arrogance, and I was punished for that.

It will not be enough to rely on experts. Ordinary citizens must become experts too. It will take public opinion on a wide scale to ensure that world leaders act.

It is better to see once than to hear a hundred times.

The social model of the Bolsheviks failed, as will any model that denies individual rights, intellectual freedom, and freedom of competing political parties. Without these freedoms and rights, there is no motivation for people to work. Such a system cannot be sustained, especially in light of the technological revolution of the information era.

If what you have done yesterday still looks big to you. You haven't done much today.

The world's deteriorating ecology poses as great a danger to mankind today as did the nuclear standoff between the superpowers at the height of the Cold War.

Humankind has no option but to protect and live in harmony with its natural environment. However, it would be regrettable if in putting an end to revolutionary extremism, we should then come to environmental extremism. We should not forget that all extremes are the same.