The greatest of all infidelities is the fear that the truth will be bad.

All socialism involves slavery. That which fundamentally distinguishes the slave is that he labours under coercion to satisfy anothers desires.

Any piece of knowledge which the pupil has himself acquired- any problem which he has himself solved, becomes, by virtue of the conquest, much more thoroughly his than it could else be. The preliminary activity of mind which his success implies, the concentration of thought necessary to it, and the excitement consequent on his triumph, conspire to register the facts in his memory in a way that no mere information heard from a teacher, or read in a schoolbook, can be registered.

The ultimate result of shielding men from the effects of folly, is to fill the world with fools.

Those who cavalierly reject the Theory of Evolution, as not adequately supported by facts, seem quite to forget that their own theory it supported by no facts at all.

The forces which are working out the great scheme of perfect happiness, taking no account of incidental suffering, exterminate such sections of mankind as stand in their way, with the same sternness that they exterminate beasts of prey and herds of useless ruminants.

Of all the knowledge, that most worth having is knowledge about health! The first requisite of a good life is to be a healthy person.