Who can tell whether the parallelogram, which in our ignorance we have defined and drawn, and the whole of whose properties we profess to know, may not be all the while panting for exterior angles, sympathetic with the interior, or sullenly repining at the fact that it cannot be inscribed in a circle?
Everywhere in the world there are ignorance and prejudice, but the greatest complex of these, with the most extensive prestige and the most intimate entanglement with traditional institutions, is the Roman Catholic Church.
Two Chinamen visiting Europe went to the theatre for the first time. One of them occupied himself with trying to understand the theatrical machinery, which he succeeded in doing. The other, despite his ignorance of the language, sought to unravel the meaning of the play. The former is like the astronomer, the latter the philosopher.
How fortunate for governments that people do not think. There is no thinking except in giving and executing commands. If it were otherwise human society could not exist.
Each is liable to panic, which is exactly, the terror of ignorance surrendered to the imagination. Knowledge is the encourager, knowledge that takes fear out of the heart, knowledge and use, which is knowledge in practice. They can conquer who believe they can. It is he who has done the deed once who does not shrink from attempting again.
Nevertheless, (Jefferson) believed that the habit of skepticism is an essential prerequisite for responsible citizenship. He argued that the cost of education is trivial compared to the cost of ignorance, of leaving government to the wolves. He taught that the country is safe only when the people rule.
For it is owing to their wonder that men both now begin and at first began to philosophize... They were pursuing science in order to know, and not for any utilitarian end.
The endless cycle of idea and action, / Endless invention, endless experiment, / Brings knowledge of motion, but not of stillness; / Knowledge of speech, but not of silence; / Knowledge of words, and ignorance of The Word.