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.

Be bold, be bold, and everywhere be bold.

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.

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

There is a principle which is a bar against all information, which cannot fail to keep a man in everlasting ignorance-that principle is contempt prior to investigation.

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.

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