The Online Library of Liberty

A project of Liberty Fund, Inc.

• Editor’s Preface.
• Book I: Of the Understanding
• Introduction.
• Part I.: Of Ideas, Their Origin, Composition, Connexion, Abstraction, &c.
• Section I.: Of the Origin of Our Ideas.
• Section II.: Division of the Subject.
• Section III.: Of the Ideas of the Memory and Imagination.
• Section IV.: Of the Connexion Or Association of Ideas.
• Section V.: Of Relations.
• Section VI.: Of Modes and Substances.
• Section VII.: Of Abstract Ideas.
• Part II.: Of the Ideas of Space and Time.
• Section I.: Of the Infinite Divisibility of Our Ideas of Space and Time.
• Section II.: Of the Infinite Divisibility of Space and Time.
• Section III.: Of the Other Qualities of Our Ideas of Space and Time.
• Section IV.: Objections Answer’d.
• Section V.: The Same Subject Continu’d.
• Section VI.: Of the Idea of Existence, and of External Existence.
• Part III.: Of Knowledge and Probability.
• Section I.: Of Knowledge.
• Section II.: Of Probability; and of the Idea of Cause and Effect.
• Section III.: Why a Cause Is Always Necessary.
• Section IV.: Of the Component Parts of Our Reasonings Concerning Cause and Effect.
• Section. V.: Of the Impressions of the Senses and Memory.
• Section VI.: Of the Inference From the Impression to the Idea.
• Section VII.: Of the Nature of the Idea Or Belief.
• Section VIII.: Of the Causes of Belief.
• Section IX.: Of the Effects of Other Relations and Other Habits.
• Section X.: Of the Influence of Belief.
• Section XI.: Of the Probability of Chances.
• Section XII.: Of the Probability of Causes.
• Section XIII.: Of Unphilosophical Probability.
• Section XIV.: Of the Idea of Necessary Connexion.
• Section XV.: Rules By Which to Judge of Causes and Effects.
• Section XVI.: Of the Reason of Animals.
• Part IV.: Of the Sceptical and Other Systems of Philosophy.
• Section I.: Of Scepticism With Regard to Reason.
• Section II.: Of Scepticism With Regard to the Senses.
• Section III.: Of the Antient Philosophy.
• Section IV.: Of the Modern Philosophy.
• Section V.: Of the Immateriality of the Soul.
• Section VI.: Of Personal Identity.
• Section VII.: Conclusion of This Book.
• Book II: Of the Passions
• Part I.: Of Pride and Humility.
• Section I.: Division of the Subject.
• Section II.: Of Pride and Humility; Their Objects and Causes.
• Section III.: Whence These Objects and Causes Are Deriv’d.
• Section IV.: Of the Relations of Impressions and Ideas.
• Section V.: Of the Influence of These Relations On Pride and Humility.
• Section VI.: Limitations of This System.
• Section VII.: Of Vice and Virtue.
• Section VIII.: Of Beauty and Deformity.
• Section IX.: Of External Advantages and Disadvantages.
• Section X.: Of Property and Riches.
• Section XI.: Of the Love of Fame.
• Section XII.: Of the Pride and Humility of Animals.
• Part II.: Of Love and Hatred.
• Section I.: Of the Objects and Causes of Love and Hatred.
• Section II.: Experiments to Confirm This System.
• Section III.: Difficulties Solv’d.
• Section IV.: Of the Love of Relations.
• Section V.: Of Our Esteem For the Rich and Powerful.
• Section VI.: Of Benevolence and Anger.
• Section VII.: Of Compassion.
• Section VIII.: Of Malice and Envy.
• Section IX.: Of the Mixture of Benevolence and Anger With Compassion and Malice.
• Section X.: Of Respect and Contempt.
• Section XI.: Of the Amorous Passion, Or Love Betwixt the Sexes.
• Section XII.: Of the Love and Hatred of Animals.
• Part III.: Of the Will and Direct Passions.
• Section I.: Of Liberty and Necessity.
• Section II.: The Same Subject Continu’d.
• Section III.: Of the Influencing Motives of the Will.
• Section IV.: Of the Causes of the Violent Passions.
• Section V.: Of the Effects of Custom.
• Section VI.: Of the Influence of the Imagination On the Passions.
• Section VII.: Of Contiguity, and Distance In Space and Time.
• Section VIII.: The Same Subject Continu’d.
• Section IX.: Of the Direct Passions.
• Section X.: Of Curiosity, Or the Love of Truth.
• Book III: Of Morals
• Part I.: Of Virtue and Vice In General.
• Section I.: Moral Distinctions Not Deriv’d From Reason.
• Section II.: Moral Distinctions Deriv’d From a Moral Sense.
• Part II.: Of Justice and Injustice.
• Section I.: Justice, Whether a Natural Or Artificial Virtue?
• Section II.: Of the Origin of Justice and Property.
• Section III.: Of the Rules, Which Determine Property.
• Section IV.: Of the Transference of Property By Consent.
• Section V.: Of the Obligation of Promises.
• Section VI.: Some Farther Reflexions Concerning Justice and Injustice.
• Section VII.: Of the Origin of Government.
• Section VIII.: Of the Source of Allegiance.
• Section IX.: Of the Measures of Allegiance.
• Section X.: Of the Objects of Allegiance.
• Section XI.: Of the Laws of Nations.
• Section XII.: Of Chastity and Modesty.
• Part III.: Of the Other Virtues and Vices.
• Section I.: Of the Origin of the Natural Virtues and Vices.
• Section II.: Of Greatness of Mind.
• Section III.: Of Goodness and Benevolence.
• Section IV.: Of Natural Abilities.
• Section V.: Some Farther Reflexions Concerning the Natural Virtues.
• Section VI.: Conclusion of This Book.
• Appendix.

SECTION IV.

Of the component parts of our reasonings concerning cause and effect.

Tho’ the mind in its reasonings from causes or effects carries its view beyond those objects, which it sees or remembers, it must never lose sight of them entirely, nor reason merely upon its own ideas, without some mixture of impressions, or at least of ideas of the memory, which are equivalent to impressions. When we infer effects from causes, we must establish the existence of these causes; which we have only two ways of doing, either by an immediate perception of our memory or senses, or by an inference from other causes; which causes again we must ascertain in the same manner, either by a present impression, or by an inference from their causes, and so on, till we arrive at some object, which we see or remember. ’Tis impossible for us to carry on our inferences in infinitum; and the only thing, that can stop them, is an impression of the memory or senses, beyond which there is no room for doubt or enquiry.

To give an instance of this, we may chuse any point of history, and consider for what reason we either believe or reject it. Thus we believe that Cæsar was kill’d in the senate-house on the ides of March; and that because this fact is establish’d on the unanimous testimony of historians, who agree to assign this precise time and place to that event. Here are certain characters and letters present either to our memory or senses; which characters we likewise remember to have been us’d as the signs of certain ideas; and these ideas were either in the minds of such as were immediately present at that action, and receiv’d the ideas directly from its existence; or they were deriv’d from the testimony of others, and that again from another testimony, by a visible gradation, ’till we arrive at those who were eye-witnesses and spectators of the event. ’Tis obvious all this chain of argument or connexion of causes and effects, is at first founded on those characters or letters, which are seen or remember’d, and that without the authority either of the memory or senses our whole reasoning wou’d be chimerical and without foundation. Every link of the chain wou’d in that case hang upon another; but there wou’d not be any thing fix’d to one end of it, capable of sustaining the whole; and consequently there wou’d be no belief nor evidence. And this actually is the case with all hypothetical arguments, or reasonings upon a supposition; there being in them, neither any present impression, nor belief of a real existence.

I need not observe, that ’tis no just objection to the present doctrine, that we can reason upon our past conclusions or principles, without having recourse to those impressions, from which they first arose. For even supposing these impressions shou’d be entirely effac’d from the memory, the conviction they produc’d may still remain; and ’tis equally true, that all reasonings concerning causes and effects are originally deriv’d from some impression; in the same manner, as the assurance of a demonstration proceeds always from a comparison of ideas, tho’ it may continue after the comparison is forgot.