An Essay Concerning Humane 
Understanding,
by John Locke 
 
The Project Gutenberg EBook of An Essay Concerning Humane 
Understanding, 
Volume I., by John Locke This eBook is for the use of anyone 
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Title: An Essay Concerning Humane Understanding, Volume I. 
MDCXC, Based on the 2nd Edition, Books I. and II. (of 4) 
Author: John Locke 
Release Date: January 6, 2004 [EBook #10615] 
Language: English 
Character set encoding: ASCII 
*** START OF THIS PROJECT GUTENBERG EBOOK HUMANE 
UNDERSTANDING, V1 *** 
 
Produced by Steve Harris and David Widger
AN ESSAY CONCERNING HUMANE UNDERSTANDING 
IN FOUR BOOKS 
BY JOHN LOCKE 
Quam bellum est velle confiteri potius nescire quod nescias, quam ista 
effutientem nauseare, atque ipsum sibi displicere. --Cic. De Natur. Deor. 
1. i. 
LONDON 
Printed by Eliz. Holt, for Thomas Basset, at the George in Fleet Street, 
near St. Dunstan's Church. 
MDCXC 
 
CONTENTS: [Based on the 2d Edition] 
EPISTLE DEDICATORY TO THE EARL OF PEMBROKE 
THE EPISTLE TO THE READER 
INTRODUCTION 
BOOK I. NEITHER PRINCIPLES NOR IDEAS ARE INNATE. 
I. NO INNATE SPECULATIVE PRINCIPLES II. NO INNATE 
PRACTICAL PRINCIPLES III. OTHER CONSIDERATIONS 
CONCERNING INNATE PRINCIPLES, BOTH SPECULATIVE 
AND PRACTICAL 
 
BOOK II. OF IDEAS. 
I. OF IDEAS IN GENERAL, AND THEIR ORIGINAL II. OF 
SIMPLE IDEAS III. OF SIMPLE IDEAS OF SENSATION IV. IDEA
OF SOLIDITY V. OF SIMPLE IDEAS OF DIVERS SENSES VI. OF 
SIMPLE IDEAS OF REFLECTION ... VII. OF SIMPLE IDEAS OF 
BOTH SENSATION AND REFLECTION VIII. SOME FURTHER 
CONSIDERATIONS CONCERNING OUR SIMPLE IDEAS OF 
SENSATION IX. OF PERCEPTION X. OF RETENTION XI. OF 
DISCERNING, AND OTHER OPERATIONS OF THE MIND XII. 
OF COMPLEX IDEAS XIII. OF SIMPLE MODES:--AND FIRST, OF 
THE SIMPLE MODES OF THE IDEA OF SPACE XIV. IDEA OF 
DURATION AND ITS SIMPLE MODES XV. IDEAS OF 
DURATION AND EXPANSION, CONSIDERED TOGETHER XVI. 
IDEA OF NUMBER AND ITS SIMPLE MODES XVII. OF THE 
IDEA OF INFINITY XVIII. OF OTHER SIMPLE MODES XIX. OF 
THE MODES OF THINKING XX. OF MODES OF PLEASURE 
AND PAIN XXI. OF THE IDEA OF POWER XXII. OF MIXED 
MODES XXIII. OF OUR COMPLEX IDEAS OF SUBSTANCES 
XXIV. OF COLLECTIVE IDEAS OF SUBSTANCES XXV. OF 
IDEAS OF RELATION XXVI. OF IDEAS OF CAUSE AND EFFECT, 
AND OTHER RELATIONS XXVII. OF IDEAS OF IDENTITY AND 
DIVERSITY XXVIII. OF IDEAS OF OTHER RELATIONS XXIX. 
OF CLEAR AND OBSCURE, DISTINCT AND CONFUSED IDEAS 
XXX. OF REAL AND FANTASTICAL IDEAS XXXI. OF 
ADEQUATE AND INADEQUATE IDEAS XXXII. OF TRUE AND 
FALSE IDEAS XXXIII. OF THE ASSOCIATION OF IDEAS 
TO THE RIGHT HONOURABLE THOMAS, EARL OF PEMBROKE 
AND MONTGOMERY, BARON HERBERT OF CARDIFF LORD 
ROSS, OF KENDAL, PAR, FITZHUGH, MARMION, ST. QUINTIN, 
AND SHURLAND; 
LORD PRESIDENT OF HIS MAJESTY'S MOST HONOURABLE 
PRIVY COUNCIL; AND LORD LIEUTENANT OF THE COUNTY 
OF WILTS, AND OF SOUTH WALES. 
MY LORD, 
This Treatise, which is grown up under your lordship's eye, and has 
ventured into the world by your order, does now, by a natural kind of 
right, come to your lordship for that protection which you several years
since promised it. It is not that I think any name, how great soever, set 
at the beginning of a book, will be able to cover the faults that are to be 
found in it. Things in print must stand and fall by their own worth, or 
the reader's fancy. But there being nothing more to be desired for truth 
than a fair unprejudiced hearing, nobody is more likely to procure me 
that than your lordship, who are allowed to have got so intimate an 
acquaintance with her, in her more retired recesses. Your lordship is 
known to have so far advanced your speculations in the most abstract 
and general knowledge of things, beyond the ordinary reach or 
common methods, that your allowance and approbation of the design of 
this Treatise will at least preserve it from being condemned without 
reading, and will prevail to have those parts a little weighed, which 
might otherwise perhaps be thought to deserve no consideration, for 
being somewhat out of the common road. The imputation of Novelty is 
a terrible charge amongst those who judge of men's heads, as they do of 
their perukes, by the fashion, and can allow none to be right but the 
received doctrines. Truth scarce ever yet carried it by vote anywhere at 
its first appearance: new opinions are always suspected, and usually 
opposed, without any other reason but because they are not already 
common. But truth, like gold, is not the less so for being newly brought 
out of the mine. It is trial and examination must give it price, and not 
any antique fashion; and though    
    
		
	
	
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