Why is revolution necessary and not man-made?

Revolution cannot be' made'. Revolution develops from objective and mature crisis and historical turning point.

Revolution has never been man-made, but a force from the bottom. But it can't happen without the revolutionary passion and positive choice of the people.

In fact, any revolution, ancient and modern, Chinese and foreign, is not the result of man-made. Only when the rulers can't rule as usual and the people can't live as usual will the revolution happen.