“It is wrong for a man to say that he is certain of the objective truth of any proposition unless he can produce evidence which logically justifies that certainty.”

“But man has such a predilection for systems and abstract deductions that he is ready to distort the truth intentionally, he is ready to deny the evidence of his senses only to justify his logic.”

“But man is so partial to systems and abstract conclusions that he is ready to distort the truth, ready to hear nor see anything, as long as he can justify his logic.”

“But man is so addicted to systems and to abstract conclusions that he is prepared deliberately to distort the truth, to close his eyes and ears, but justify his logic at all cost. ”

“If any man at this day sincerely believes that a proper division of local from federal authority, or any part of the Constitution, forbids the Federal Government to control as to slavery in the federal territories, he is right to say so, and to enforce his position by all truthful evidence and fair argument which he can. But he has no right to mislead others, who have less access to history, and less leisure to study it, into the false belief that "our fathers who framed the Government under which we live" were of the same opinion - thus substituting falsehood and deception for truthful evidence and fair argument.”

“The object [Duchamp's Fountain] was rejected , giving Duchamp the opportunity of issuing a statement, which he published in a review, The Blind Man. In his statement he emphasized that the act of choice was sufficient to justify it as a creative art. Placing it in such a way that its normal use was disguised caused a new reality for the object to be invented. To the criticism that it was rude he replied, logically enough,"How could this object be acceptable when displayed in a plumber's shop window and yet be immoral anywhere else?”