equilibrium quotes

The point of equilibrium will be known by the criterion that an infinitely small amount of commodity exchanged in addition, at the same rate, will bring neither gain nor loss of utility.

-William Stanley Jevons
The Theory of Political Economy.

All plays are about decay† That is why the theater has always been essential to human psychic equilibrium.

- David Alan Mamet
  Writing in Restaurants,'Decay: Some Thoughts for  Actors'.

It cannot but happen†that those will survive whose functions happen to be most nearly in equilibrium with the modified aggregate of external forces† This survival of the fittest implies multiplication of the fittest.

- Herbert Spencer
  Principles of Biology, pt.3, ch.12, sect.164.