Thomas Jefferson quote: “I was bold in the pursuit of knowledge, never fearing to follow truth and reason to whatever results they led.”

“And this, Cebes, is the reason why the true lovers of knowledge are temperate and brave; and not for the reason that the world gives. For not in that way does the soul of a philosopher reason. …Never fear, Simmias and Cebes, that a soul which has been thus nurtured and has had these pursuits, will at her departure from the body be scattered and blown away by the winds and be nowhere and nothing.”

Socrates (-470–-399 BC) classical Greek Athenian philosopher

Plato, Phaedo

“The intentionality peculiar to motor activity is not a search for truth but the pursuit of a result, whether objective or subjective; and to succeed is not to discover a truth.”

Jean Piaget (1896–1980) Swiss psychologist, biologist, logician, philosopher & academic

Source: The Moral Judgment of the Child (1932), Ch. 2 : Adult Constraint and Moral Realism 
Context: Generally speaking, one can say that motor intelligence contains the germs of completed reason. But it gives promise of more than reason pure and simple. From the moral as from the intellectual point of view, the child is born neither good nor bad, but master of his destiny. Now, if there is intelligence in the schemas of motor adaptation, there is also the element of play. The intentionality peculiar to motor activity is not a search for truth but the pursuit of a result, whether objective or subjective; and to succeed is not to discover a truth.

“Chaucer followed Nature everywhere, but was never so bold to go beyond her.”

John Dryden book Fables, Ancient and Modern

Preface to the Fables.
Fables, Ancient and Modern (1700)

“As a child I was taught that to tell the truth was often painful. As an adult I have learned that not to tell the truth is more painful, and that the fear of telling the truth — whatever the truth may be — that fear is the most painful sensation of a moral life.”

June Jordan (1936–2002) Poet, essayist, playwright, feminist and bisexual activist

"Life After Lebanon" (1984), later published in On Call : Political Essays (1985), and Some of Us Did Not Die : New and Selected Essays of June Jordan (2002)

“Every knowledge in which the reason is involved is not a rational knowledge. It means that any knowledge because the reason is involved in it cannot be considered as a rational knowledge. In a rational knowledge, it is necessary that in addition to the existence of reason, the judgment of reason about the thing that is to be known should be consistent with the reason and be rational. It is also necessary that the result of this knowledge be rational so that we consider that knowledge a rational knowledge”

Taraneh Javanbakht (1974) Iranian scientist, faculty, poet, translator, playwright and writer

the necessary and sufficient conditions for rational knowledge
Source: Great Islamic Encyclopedia website, 2016 https://www.cgie.org.ir/fa/news/154958

“Question with boldness even the existence of a god; because, if there be one, he must more approve the homage of reason, than that of blindfolded fear.”

Thomas Jefferson (1743–1826) 3rd President of the United States of America

Scan of the original page http://memory.loc.gov/master/mss/mtj/mtj1/007/0900/0961.jpg at The Library of Congress.
1780s, Letter to Peter Carr (1787)
Context: Your reason is now mature enough to examine this object [religion]. In the first place divest yourself of all bias in favour of novelty & singularity of opinion. Indulge them in any other subject rather than that of religion. It is too important, & the consequences of error may be too serious. On the other hand shake off all the fears & servile prejudices under which weak minds are servilely crouched. Fix reason firmly in her seat, and call to her tribunal every fact, every opinion. Question with boldness even the existence of a god; because, if there be one, he must more approve the homage of reason, than that of blindfolded fear.

“What we want to see is the child in pursuit of the knowledge not the knowledge in pursuit of the child.”

George Bernard Shaw (1856–1950) Irish playwright

“(…) New knowledge has led to the recognition of the theory of evolution as more than a hypothesis. It is indeed remarkable that this theory has been progressively accepted by researchers, following a series of discoveries in various fields of knowledge. The convergence, neither sought nor fabricated, of the results of work that was conducted independently is in itself a significant argument in favor of this theory.”

Pope John Paul II (1920–2005) 264th Pope of the Catholic Church, saint

(...) De nouvelles connaissances conduisent à reconnaître dans la théorie de l'évolution plus qu'une hypothèse. Il est en effet remarquable que cette théorie se soit progressivement imposée à l'esprit des chercheurs, à la suite d'une série de découvertes faites dans diverses disciplines du savoir. La convergence, nullement recherchée ou provoquée, des résultats de travaux menés indépendamment les uns des autres, constitue par elle même un argument significatif en faveur de cette théorie.
early news reports mistranslated the French phrase plus qu'une hypothèse as "more than one hypothesis". http://www.cartage.org.lb/en/themes/sciences/LifeScience/PhysicalAnthropology/EvolutionFact/Evolution/Evolution.htm
Message to the participants in the Plenary of the Pontifical Academy of Sciences, 22 October 1996
Source: Libreria Editrice Vaticana http://www.vatican.va/holy_father/john_paul_ii/messages/pont_messages/1996/documents/hf_jp-ii_mes_19961022_evoluzione_fr.html (French)

“By induction we gain no certain knowledge; but by observation, and the inverse use of deductive reasoning, we estimate the probability that an event which has occurred was preceded by conditions of specified character, or that such conditions will be followed by the event. …I have no objection to use the words cause and causation, provided they are never allowed to lead us to imagine that our knowledge of nature can attain to certainty. …We can never recur too often to the truth that our knowledge of the laws and future events of the external world are only probable.”

William Stanley Jevons (1835–1882) English economist and logician

Source: The Principles of Science: A Treatise on Logic and Scientific Method (1874) Vol. 1, pp. 257, 260 & 271

“It follows then that whatever the moral reasons for conservation it will only be achieved by the inducement of profit or pleasure.”

Prince Philip, Duke of Edinburgh (1921) member of the British Royal Family, consort to Queen Elizabeth II

World Wildlife Fund: British National Appeal Banquet, London (1962)
The Environmental Revolution: Speeches on Conservation, 1962–77 (1978)
Context: For conservation to be successful it is necessary to take into consideration that it is a characteristic of man that he can only be relied upon to do anything consistently which is in his own interest. He may have occasional fits of conscience and moral rectitude but otherwise his actions are governed by self-interest. It follows then that whatever the moral reasons for conservation it will only be achieved by the inducement of profit or pleasure.

“I was bold in the pursuit of knowledge, never fearing to follow truth and reason to whatever results they led.”

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