Quotes from book
An Enquiry Concerning Human Understanding

Name: An Enquiry Concerning Human Understanding
Author: David Hume

An Enquiry Concerning Human Understanding is a book by the Scottish empiricist philosopher David Hume, published in English in 1748. It was a revision of an earlier effort, Hume's A Treatise of Human Nature, published anonymously in London in 1739–40. Hume was disappointed with the reception of the Treatise, which "fell dead-born from the press," as he put it, and so tried again to disseminate his more developed ideas to the public by writing a shorter and more polemical work.

“Custom, then, is the great guide of human life.”

David Hume book An Enquiry Concerning Human Understanding

Variant (perhaps a paraphrase of this passage): It is not reason which is the guide of life, but custom.
An Enquiry Concerning Human Understanding (1748)
Context: Custom, then, is the great guide of human life. It is that principle alone which renders our experience useful to us, and makes us expect, for the future, a similar train of events with those which have appeared in the past. Without the influence of custom, we should be entirely ignorant of every matter of fact beyond what is immediately present to the memory and senses. We should never know how to adjust means to ends, or to employ our natural powers in the production of any effect. There would be an end at once of all action, as well as of the chief part of speculation.

“Eloquence, when at its highest pitch, leaves little room for reason or reflection; but addressing itself entirely to the fancy or the affections, captivates the willing hearers, and subdues their understanding.”

David Hume book An Enquiry Concerning Human Understanding

Section 10 : Of Miracles Pt. 2
An Enquiry Concerning Human Understanding (1748)
Context: Eloquence, when at its highest pitch, leaves little room for reason or reflection; but addressing itself entirely to the fancy or the affections, captivates the willing hearers, and subdues their understanding. Happily, this pitch it seldom attains. But what a Tully or a Demosthenes could scarcely effect over a Roman or Athenian audience, every Capuchin, every itinerant or stationary teacher can perform over the generality of mankind, and in a higher degree, by touching such gross and vulgar passions.

“Nature has pointed out a mixed kind of life as most suitable to the human race, and secretly admonished them to allow none of these biases to draw too much, so as to incapacitate them for other occupations and entertainments.”

David Hume book An Enquiry Concerning Human Understanding

Section 1 : Of The Different Species of Philosophy
An Enquiry Concerning Human Understanding (1748)
Context: Nature has pointed out a mixed kind of life as most suitable to the human race, and secretly admonished them to allow none of these biases to draw too much, so as to incapacitate them for other occupations and entertainments. Indulge your passion for science, says she, but let your science be human, and such as may have a direct reference to action and society. Abstruse thought and profound researches I prohibit, and will severely punish, by the pensive melancholy which they introduce, by the endless uncertainty in which they involve you, and by the cold reception which your pretended discoveries shall meet with, when communicated. Be a philosopher; but, amidst all your philosophy, be still a man.

“Be a philosopher; but, amidst all your philosophy, be still a man.”

David Hume book An Enquiry Concerning Human Understanding

Section 1 : Of The Different Species of Philosophy
Source: An Enquiry Concerning Human Understanding (1748)
Context: Nature has pointed out a mixed kind of life as most suitable to the human race, and secretly admonished them to allow none of these biases to draw too much, so as to incapacitate them for other occupations and entertainments. Indulge your passion for science, says she, but let your science be human, and such as may have a direct reference to action and society. Abstruse thought and profound researches I prohibit, and will severely punish, by the pensive melancholy which they introduce, by the endless uncertainty in which they involve you, and by the cold reception which your pretended discoveries shall meet with, when communicated. Be a philosopher; but, amidst all your philosophy, be still a man.

“In our reasonings concerning matter of fact, there are all imaginable degrees of assurance, from the highest certainty to the lowest species of moral evidence..”

David Hume book An Enquiry Concerning Human Understanding

Source: An Enquiry Concerning Human Understanding

“… no testimony is sufficient to establish a miracle, unless the testimony be of such a kind, that its falsehood would be more miraculous, than the fact, which it endeavors to establish.”

David Hume book An Enquiry Concerning Human Understanding

Section 10 : Of Miracles Pt. 1
An Enquiry Concerning Human Understanding (1748)
Source: An Enquiry Concerning Human Understanding/An Enquiry Concerning the Principles of Morals

“Though experience be our only guide in reasoning concerning matters of fact; it must be acknowledged, that this guide is not altogether infallible, but in some cases is apt to lead us into errors.”

David Hume book An Enquiry Concerning Human Understanding

Section 10 : Of Miracles Pt. 1
An Enquiry Concerning Human Understanding (1748)

“Necessity may be defined in two ways, conformably to the two definitions of cause, of which it makes an essential part. It consists either in the constant conjunction of like objects, or in the inference of the understating from one object to another.”

David Hume book An Enquiry Concerning Human Understanding

§ 8.27
An Enquiry Concerning Human Understanding (1748)

“In vain, therefore, should we pretend to determine any single event, or infer any cause or effect, without the assistance of observation and experience.”

David Hume book An Enquiry Concerning Human Understanding

§ 4.11
An Enquiry Concerning Human Understanding (1748)

“Hypothetical liberty is allowed to everyone who is not a prisoner and in chains”

David Hume book An Enquiry Concerning Human Understanding

§ 8.23
An Enquiry Concerning Human Understanding (1748)

“The most perfect philosophy of the natural kind only staves off our ignorance a little longer: as perhaps the most perfect philosophy of the moral or metaphysical kind serves only to discover larger portions of it. Thus the observation of human blindness and weakness is the result of all philosophy, and meets us at every turn, in spite of our endeavours to elude or avoid it.”

David Hume book An Enquiry Concerning Human Understanding

Section 4 : Sceptical Doubts Concerning The Operations of The Understanding
An Enquiry Concerning Human Understanding (1748)

“THERE is no method of reasoning more common, and yet none more blameable, than, in philosophical disputes, to endeavour the refutation of any hypothesis, by a pretence of its dangerous consequences to religion and morality.”

David Hume book An Enquiry Concerning Human Understanding

Of Liberty and Necessity, Part II (http://www.bartleby.com/37/3/12.html)
An Enquiry Concerning Human Understanding (1748)
Context: THERE is no method of reasoning more common, and yet none more blameable, than, in philosophical disputes, to endeavour the refutation of any hypothesis, by a pretence of its dangerous consequences to religion and morality. When any opinion leads to absurdities, it is certainly false; but it is not certain that an opinion is false, because it is of dangerous consequence. Such topics, therefore, ought entirely to be forborne; as serving nothing to the discovery of truth, but only to make the person of an antagonist odious.

“When we run over libraries, persuaded of these principles, what havoc must we make? If we take in our hand any volume; of divinity or school metaphysics, for instance; let us ask, Does it contain any abstract reasoning concerning quantity or number? No. Does it contain any experimental reasoning concerning matter of fact and existence? No. Commit it then to the flames: For it can contain nothing but sophistry and illusion.”

David Hume book An Enquiry Concerning Human Understanding

Section 12 : Of the Academical or Sceptical Philosophy Pt. 3
An Enquiry Concerning Human Understanding (1748)

“The Christian Religion not only was at first attended with miracles, but even at this day cannot be believed by any reasonable person without one. Mere reason is insufficient to convince us of its veracity: and whoever is moved by Faith to assent to it, is conscious of a continued miracle in his own person, which subverts all the principles of his understanding, and gives him a determination to believe what is most contrary to custom and experience.”

David Hume book An Enquiry Concerning Human Understanding

Section 10 : Of Miracles Pt. 2
An Enquiry Concerning Human Understanding (1748)

“By liberty, then, we can only mean a power of acting or not acting, according to the determinations of the will.”

David Hume book An Enquiry Concerning Human Understanding

§ 8.23
An Enquiry Concerning Human Understanding (1748)

“That the sun will not rise to-morrow is no less intelligible a proposition, and implies no contradiction, than the affirmation, that it will rise.”

David Hume book An Enquiry Concerning Human Understanding

§ 4.8
An Enquiry Concerning Human Understanding (1748)

“What would become of history, had we not a dependence on the veracity of the historian, according to the experience, what we have had of mankind?”

David Hume book An Enquiry Concerning Human Understanding

§ 8.18
An Enquiry Concerning Human Understanding (1748)

“I say, then, that belief is nothing but a more vivid, lively, forcible, firm, steady conception of an object, than what the imagination alone is ever able to attain”

David Hume book An Enquiry Concerning Human Understanding

§ 4.9
An Enquiry Concerning Human Understanding (1748)

“When anyone tells me, that he saw a dead man restored to life, I immediately consider with myself, whether it be more probable, that this person should either deceive or be deceived, or that the fact, which he relates, should really have happened. I weigh the one miracle against the other; and according to the superiority, which I discover, I pronounce my decision, and always reject the greater miracle. If the falsehood of his testimony would be more miraculous, than the event which he relates; then, and not till then, can he pretend to command my belief or opinion.”

David Hume book An Enquiry Concerning Human Understanding

Section 10 : Of Miracles Pt. 1
An Enquiry Concerning Human Understanding (1748)

“A wise man, therefore, proportions his belief to the evidence.”

David Hume book An Enquiry Concerning Human Understanding

Section X: Of Miracles; Part I. 87
An Enquiry Concerning Human Understanding (1748)
Context: In our reasonings concerning matter of fact, there are all imaginable degrees of assurance, from the highest certainty to the lowest species of moral evidence. A wise man, therefore, proportions his belief to the evidence.