Those who have never entered upon scientific pursuits know not a tithe of the poetry by which they are surrounded.

Never educate a child to be a gentleman or lady alone, but to be a man, a woman.

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.

Progress, therefore, is not an accident, but a necessity…It is a part of nature.

The preservation of health is a duty. Few seem conscious that there is such a thing as physical morality.

The belief, not only of the socialist but of those so-called liberals who are diligently preparing the way for them is that by due skill an ill working humanity may be framed into well-working initiations. It is delusion. The defective natures of citizens will show themselves in bad acting of whatever social structure they are arranged into. There is no political alchemy by which you can get golden conduct out of laden instincts.

The "Creed of Christendom" is alien to my nature, both emotional and intellectual.