The Political Works of Thomas Hobbes (4 Books in One Edition). Thomas Hobbes
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to have concluded against reason: and such a conclusion is called absurdity.
13. As the invention of names hath been necessary for the drawing of men out of ignorance, by calling to their remembrance the necessary coherence of one conception to another; so also hath it on the other side precipitated men into error: insomuch, that whereas by the benefit of words and ratiocination they exceed brute beasts in knowledge; by the incommodities that accompany the same they exceed them also in errors. For true and false are things not incident to beasts, because they adhere to propositions and language; nor have they ratiocination, whereby to multiply one untruth by another.. as men have.
14. It is the nature almost of every corporeal thing, being often moved in one and the same manner, to receive continually a greater and greater easiness and aptitude to the same motion; insomuch as in time the same becometh so habitual, that to beget it, there needs no more than to begin it. The passions of man, as they are the beginning of all his voluntary motions, so are they the beginning of speech, which is the motion of his tongue. And men desiring to shew others the knowledge, opinions, conceptions, and passions which are within themselves, and to that end. having invented language, have by that means transferred all that discursion of their mind mentioned in the former chapter, by the motion of their tongues, into discourse of words; and ratio, now, is but oratio, for the most part, wherein custom hath so great a power, that the mind suggesteth only the first word, the rest follow habitually, and are not followed by the mind. As it is with beggars, when they say their paternoster, putting together such words, and in such manner, as in their education they have learned from their nurses, from their companions, or from their teachers, having no images or conceptions in their minds answering to the words they speak. And as they have learned themselves, so they teach posterity. Now, if we consider the power of those deceptions of sense, mentioned chapter 11 section 10, and also how unconstantly names have been settled, and how subject they are to equivocation, and how diversified by passion, (scarce two men agreeing what is to be called good, and what evil; what liberality, what prodigality; what valour, what temerity) and how subject men are to paralogism or fallacy in reasoning, I may in a manner conclude, that it is impossible to rectify so many errors of any one man, as must needs proceed from those causes, without beginning anew from the very first grounds of all our knowledge, sense; and, instead of books, reading over orderly one's own conceptions: in which meaning I take nosce teipsum for a precept worthy the reputation it hath gotten.
Chapter 6: Of a Knowledge, Opinion and Relief
1. There is a story somewhere, of one that pretended to have been miraculously cured of blindness, wherewith he was born, by St. Alban or other St., at the town of St. Alban's; and that the Duke of Gloucester being there, to be satisfied of the truth of the miracle, asked the man, What colour is this? who, by answering, It is green, discovered himself, and was punished for a counterfeit: for though by his sight newly received he might distinguish between green, and red, and all other colours, as well as any that should interrogate him, yet he could not possibly know at first sight, which of them was called green, or red, or by other name. By this we may understand, there be two sorts of knowledge, whereof the one is nothing else but sense, or knowledge original (as I have said at the beginning of the second chapter), and remembrance of the same; the other is called science or knowledge of the truth of propositions, and how things are called, and is derived from understanding. Both of these sorts are but experience; the former being the experience of the effects of things that work upon us from without; and the latter the experience men have of the proper use of names in language. And all experience being (as I have said) but remembrance, all knowledge is remembrance: and of the former, the register we keep in books, is called history. but the registers of the latter are called the sciences.
2. There are two things necessarily implied in this word knowledge; the one is truth, the other evidence; for what is not true, can never be known. For let a man say he knoweth a thing never so well, if the same shall afterwards appear to be false, he is driven to a confession, that it was not knowledge, but opinion. Likewise, if the truth be not evident, though a man holdeth it, yet is his knowledge of it no more than theirs that hold the contrary. For if truth were enough to make it knowledge, all truths were known: which is not so.
3. What truth is, hath been defined in the precedent chapter; what evidence is, I now set down. And it is the concomitance of a man's conception with the words that signify such conception in the act of ratiocination. For when a man reasoneth with his lips only, to which the mind suggesteth only the beginning, and followeth not the words of his mouth with the conceptions of his mind, out of a custom of so speaking; though he begin his ratiocination with true propositions, and proceed with perfect syllogisms, and thereby make always true conclusions; yet are not his conclusions evident to him, for want of the concomitance of conception with his words. For if the words alone were sufficient, a parrot might be taught as well to know a truth, as to speak it. Evidence is to truth, as the sap is to the tree, which so far as it creepeth along with the body and branches, keepeth them alive; when it forsaketh them, they die. For this evidence, which is meaning with our words, is the life of truth; without it truth is nothing worth.
4. Knowledge, therefore, which we call SCIENCE, I define to be evidence of truth, from some beginning or principle of sense. For the truth of a proposition is never evident, until we conceive the meaning of the words or terms whereof it consisteth, which are always conceptions of the mind; nor can we remember those conceptions, without the thing that produced the same by our senses. The first principle of knowledge therefore is, that We have such and such conceptions; the second, that we have thus and thus named the things whereof they are conceptions; the third is, that we have joined those names in such manner, as to make true propositions; the fourth and last is, that we have joined those propositions in such manner as they be concluding. And by these four steps the conclusion is known and evident, and the truth of the conclusion said to be known. And of these two kinds of knowledge, whereof the former is experience of fact, and the latter evidence of truth: as the former, if it be great, is called prudence, so the latter, if it be much, hath usually been called, both by ancient and modern writers, SAPIENCE or wisdom: and of this latter, man only is capable; of the former, brute beasts also participate.
5. A proposition is said to be supposed, when, being not evident, it is nevertheless admitted for a time, to the end, that joining to it other propositions, we may conclude something; and so proceed from conclusion to conclusion, for a trail whether the same will lead us into any absurd or impossible conclusion; which if it do, then we know such supposition to have been false.
6. But if running through many conclusions, we come to none that are absurd, then we think the supposition probable; likewise we think probable whatsoever proposition we admit for truth by error of reasoning, or from trusting to other men. And all such propositions as are admitted by trust or error, we are not said to know, but think them to be true: and the admittance of them is called OPINION.
7. And particularly, when the opinion is admitted out of trust to other men, they are said to believe it; and their admittance of it is called BELIEF, and sometimes faith.
8. It is either science or opinion which we commonly mean by the word conscience: for men say that such and such a thing is true upon, or in their consciences; which they never do, when they think it doubtful; and therefore they know, or think they know it to be true. But men, when they say things upon their conscience, are not therefore presumed certainly to know the truth of what they say. It remaineth then, that that word is used by them that have an opinion, not only of the truth of the thing, but also of their knowledge of it. So that conscience, as men commonly use the word, signifieth an opinion, not so much of the truth of the proposition, as of their own knowledge of it, to which the truth of the proposition is consequent. CONSCIENCE therefore I define to be opinion of evidence.
9. Belief, which is the admitting of propositions upon trust, in many cases is no less free from doubt, than perfect and manifest knowledge. For as there is nothing whereof there is not some cause; so, when there is doubt, there must be some cause thereof conceived. Now there be many things which we receive from report of others, of which it is impossible to imagine any cause