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

Agnostics are people who, like myself, confess themselves to be hopelessly ignorant concerning a variety of matters, about which metaphysicians and theologians, both orthodox and heterodox, dogmatize with the utmost confidence.

Old forms of government finally grow so oppressive that they must be thrown off even at the risk of reigns of terror.

Divine right of kings means the divine right of anyone who can get uppermost.

If every man has freedom to do all that he wills, provided he infringes not the equal freedom of any other man, then he is free to drop connection with the state-to relinquish its protection, and to refuse paying toward its support.

Every cause produces more than one effect.

Love is life's end, but never ending. Love is life's wealth, never spent, but ever spending. Love's life's reward, rewarded in rewarding.