We become aware, however, that all customs, even the hardest, grow pleasanter and milder with time, and that the severest way of life may become a habit and therefore a pleasure.
Those who are not angry at the things they should be angry at are thought to be fools, and so are those who are not angry in the right way, at the right time, or with the right persons.
For a finite-size system to persist in time (to live), it must evolve in such a way that it provides easier access to the imposed currents that flow through it.