Instead of establishing facts, we have to overthrow errors; instead of ascertaining what is, we have to chase from our imaginations what is not.

Of the thousands who have paid homage to virtue, barely one has thought to inspect the pedestal on which it stands.

... your spiritual teachers caution you against enquiry--tell you not to read certain books; not to listen to certain people; to beware of profane learning; to submit your reason, and to receive their doctrines for truths. Such advice renders them suspicious counsellors.

Trust me, there are as many ways of living as there are men, and one is no more fit to lead another, than a bird to lead a fish, or a fish a quadruped.

All that I say is, examine, inquire. Look into the nature of things. Search out the grounds of your opinions, the for and against. Know why you believe, understand what you believe, and possess a reason for the faith that is in you.

Opinions are not to be learned by rote, like the letters of an alphabet, or the words of a dictionary. They are conclusions to be formed, and formed by each individual in the sacred and free citadel of the mind, and there enshrined beyond the arm of law to reach, or force to shake; ay! and beyond the right of impertinent curiosity to violate, or presumptuous arrogance to threaten.

So long as the mental and moral instruction of man is left solely in the hands of hired servants of the public--let them be teachers of religion, professors of colleges, authors of books, or editors of journals or periodical publications, dependent upon their literary incomes for their daily bread, so long shall we hear but half the truth; and well if we hear so much. Our teachers, political, scientific, moral, or religious; our writers, grave or gay, are compelled to administer to our prejudices and to perpetuate our ignorance.