Limiting the liberty of each by the like liberty of all, excludes a wide range of improper actions, but does not exclude certain other improper ones. - Herbert Spencer

No one can be perfectly happy till all are happy.

Throughout all organic nature there is at work a modifying influence of the kind... as the cause, these specific differences: an influence which, though slow in its action, does, in time, if the circumstances demand it, produce marked changes—an influence, which to all appearance, would produce in the millions of years, and under the great varieties of condition which geological records imply, any amount of change.

As there must be moderation in other things, so there must be moderation in self-criticism. Perpetual contemplation of our own actions produces a morbid consciousness, quite unlike that normal consciousness accompanying right actions spontaneously done; and from a state of unstable equilibrium long maintained by effort, there is apt to be a fall towards stable equilibrium, in which the primitive nature reasserts itself. Retrogression rather than progression may hence result.