The greatest problem for the human species, the solution of which nature compels him to seek, is that of attaining a civil society which can administer justice universally.

How then is perfection to be sought? Wherein lies our hope? In education, and in nothing else.

Two things fill the mind with ever new and increasing admiration and awe, the oftener and more steadily we reflect on them: the starry heavens above and the moral law within.

Rules for Happiness: something to do, someone to love, something to hope for.

No state at war with another state should engage in hostilities of such a kind as to render mutual confidence impossible when peace will have been made.

The history of the human race, viewed as a whole, may be regarded as the realization of a hidden plan of nature to bring about a political constitution, internally, and for this purpose, also externally perfect, as the only state in which all the capacities implanted by her in mankind can be fully developed.

The greatest human quest is to know what one must do in order to become a human being.