
“He that is not aware of his ignorance, will be only misled by his knowledge.”
Thoughts and Apophthegms from the Writings of Archbishop Whately (1856), p. 164 http://books.google.com/books?id=kW8YAAAAIAAJ&pg=PA164
Eugenics, academic and practical. Eugenics Review, 27, 95-100, 1935.
The original has ‘to store it as’ inserted before the final words ‘a warehouse’, likely a mistake left from an earlier draft.
1930s
“He that is not aware of his ignorance, will be only misled by his knowledge.”
Thoughts and Apophthegms from the Writings of Archbishop Whately (1856), p. 164 http://books.google.com/books?id=kW8YAAAAIAAJ&pg=PA164
George Roussos as quoted by George Roussos in Gruenwald, Mark (April 1983). "George Roussos". Comics Interview (2) (Fictioneer Books). pp. 45–51.
About
Lecture on Bhagavad-gita, Chapter 7, verse 18; New York; http://prabhupadabooks.com/classes/bg/7/18/new_york/october/12/1966?d=1 (12 October 1966)
Source: The Meaning of God in Human Experience (1912), Ch. XVI : The Original Sources of the Knowledge of God, p. 237.
The Ethics of Belief (1877), The Weight Of Authority
Context: In what cases, then, let us ask in the first place, is the testimony of a man unworthy of belief? He may say that which is untrue either knowingly or unknowingly. In the first case he is lying, and his moral character is to blame; in the second case he is ignorant or mistaken, and it is only his knowledge or his judgment which is in fault. In order that we may have the right to accept his testimony as ground for believing what he says, we must have reasonable grounds for trusting his veracity, that he is really trying to speak the truth so far as he knows it; his knowledge, that he has had opportunities of knowing the truth about this matter; and his judgment, that he has made proper use of those opportunities in coming to the conclusion which he affirms.
However plain and obvious these reasons may be, so that no man of ordinary intelligence, reflecting upon the matter, could fail to arrive at them, it is nevertheless true that a great many persons do habitually disregard them in weighing testimony. Of the two questions, equally important to the trustworthiness of a witness, "Is he dishonest?" and "May he be mistaken?" the majority of mankind are perfectly satisfied if one can, with some show of probability, be answered in the negative. The excellent moral character of a man is alleged as ground for accepting his statements about things which he cannot possibly have known.
Der Glaube an eine bestimmte Idee gibt dem Forscher den Rückhalt für seine Arbeit. Ohne diesen Glauben wäre er verloren in einem Meer von Zweifeln und halbgültigen Beweisen.
Attributed in Konrad Zuse http://www.dpma.de/ponline/erfindergalerie/bio_zuse.html on "Die Erfindergalerie", dpma.de, 2008
Source: Psychology of management, 1914, p. 1-2