The period of greatest gain in knowledge and experience is the most difficult period in one's life.

As far as social-economic theory is concerned, I am still a Marxist

China has to go along with world trends. That's democracy, liberty, individual freedom. China sooner or later has to go that way. It cannot go backward.

I don't know whether the universe, with its countless galaxies, stars and planets, has a deeper meaning or not, but at the very least, it is clear that we humans who live on this earth face the task of making a happy life for ourselves. Therefore, it is important to discover what will bring about the greatest degree of happiness.

World belongs to humanity, not this leader, that leader or that king or prince or religious leader. World belongs to humanity.

So the first step in seeking happiness is learning. We first have to learn how negative emotions and behaviors are harmful to us and how positive emotions are helpful.

Without changing one's self, without peace in one's self, world peace is not possible.