Where there are problems, there is life.

I can live with doubt and uncertainty. I think it's much more interesting to live not knowing than to have answers which might be wrong.

I cannot deny the feeling of unreality in writing about the first three minutes as if we really know what we are

talking about.

We know many laws of nature and we hope and expect to discover more. Nobody can foresee the next such law that will be discovered. Nevertheless, there is a structure in laws of nature which we call the laws of invariance. This structure is so far-reaching in some cases that laws of nature were guessed on the basis of the postulate that they fit into the invariance structure.