Science is organized knowledge.

Time: That which man is always trying to kill, but which ends in killing him.

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.

The question of questions for the politicians should ever be-What type of social structure am I tending to produce? But this is a question he never entertains.

No one can be perfectly free till all are free; no one can be perfectly moral till all are moral; no one can be perfectly happy till all are happy.

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.

Mother, when your children are irritable, do not make them more so by scolding and fault-finding, but correct their irritability by good nature and mirthfulness. Irritability comes from errors in food, bad air, too little sleep, a necessity for change of scene and surroundings; from confinement in close rooms, and lack of sunshine.