"It is as certain as it is strange that truth and error come from one and the same source; for that reason one must often not do something to the detriment of error since one would do also something detrimental to truth."
"But lest I should mislead any when I have my own head and obey my whims, let me remind the reader that I am only an experimenter.Do not set the least value on what I do, or the least discredit on what I do not, as if I pretended to settle any thing as true or false. I unsettle all things. No facts are to me sacred; none are profane; I simply experiment, an endless seeker with no Past at my back."
"If I have renounced the search of truth, if I have come into the port of some pretending dogmatism, some new church, some Schelling or Cousin, I have died to all use of these new events that are born out of prolific time into multitude of life every hour. I am as bankrupt to whom brilliant opportunities offer in vain. He has just foreclosed his freedom, tied his hands, locked himself up and given the key to another to keep."
"The secret of genius is to suffer no fiction to exist for us; to realize all that we know; in the high refinement of modern life,in arts, in sciences, in books, in men, to exact good faith, reality, and a purpose; and first, last, midst, and without end, to honor every truth by use."
"The expansive nature of truth comes to our succor, elastic, not to be surrounded. Man helps himself by larger generalizations. Thelesson of life is practically to generalize; to believe what the years and the centuries say against the hours; to resist the usurpation of particulars; to penetrate to their catholic sense."