Nothing is more practical than a good theory.

Bring forward what is true, Write it so that it is clear, Defend it to your last breath!

A mathematician will recognise Cauchy, Gauss, Jacobi or Helmholtz after reading a few pages, just as musicians recognise, from the first few bars, Mozart, Beethoven or Schubert.

Thermodynamics, correctly interpreted, does not just allow Darwinian evolution it favors it.

The life contest is primarily a competition for available energy.

Philosophy gets on my nerves. If we analyze the ultimate ground of everything, then everything finally falls into nothingness. But I have decided to resume my lectures again and look the Hydra of doubt straight into the eye, and it be quite ominous if one values one's life.