This is what the painter, the poet, the speculative philosopher, and the natural scientists do, each in his own fashion.

Nevertheless, it is necessary to remember that a planned economy is not yet socialism. A planned economy as such may be accompanied by the complete enslavement of the individual. The achievement of socialism requires the solution of some extremely difficult socio-political problems: how is it possible, in view of the far-reaching centralisation of political and economic power, to prevent bureaucracy from becoming all-powerful and overweening? How can the rights of the individual be protected and therewith a democratic counterweight to the power of bureaucracy be assured?

Women always worry about things that men forget; men always worry about things women remember.

Imagination is more important than knowledge.

The same thinking that has led you to where you are is not going to lead you to where you want to go.

To raise new questions, new possibilities, to regard old problems from a new angle, requires creative imagination and marks real advance in science.

If I could do it all again, I'd be a plumber.