Every man is free to do that which he wills, provided he infringes not the equal freedom of any other man.

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.

Ethical ideas and sentiments have to be considered as parts of the phenomena of life at large. We have to deal with man as a product of evolution, with society as a product of evolution, and with moral phenomena as products of evolution.

How often misused words generate misleading thoughts!

The universal basis of co-operation is the proportioning of benefits received to services rendered.

The essential trait in the moral consciousness, is the control of some feeling or feelings by some other feeling or feelings.

Every pleasure raises the tide of life; every pain lowers the tide of life.