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

• The more specific idea of Evolution now reached is - a change from an indefinite, incoherent homogeneity to a definite, coherent heterogeneity, accompanying the dissipation of motion and integration of matter.
• In science the important thing is to modify and change one's ideas as science advances.
• The great aim of education is not knowledge but action.
• Education has for its object the formation of character.
• We do not commonly see in a tax a diminution of freedom, and yet it clearly is one.
• Hero-worship is strongest where there is least regard for human freedom.
• The wise man must remember that while he is a descendant of the past, he is a parent of the future.
• Government is essentially immoral.
• The Republican form of government is the highest form of government: but because of this it requires the highest type of human nature, a type nowhere at present existing.
• Old forms of government finally grow so oppressive that they must be thrown off even at the risk of reigns of terror.