Hello,
John Locke’s essay was called The Essay on Human Understanding, first published in 1960s in which he describes the mind at birth as a blank slate; the essay is about the foundation of human knowledge and understanding. It was hugely influential regarding empiricism in modern philosophy. Locke’s work influenced many enlightenment philosophers such as Hume and Berkeley. The Enlightenment or The Age of Enlightenment, is used to describe the time in Western Philosophy in the eighteenth century, when reason was put forward as the best, and the source of authority.
The essay is split up into four different books, most of the interesting ideas happen in book II. In the rest of this entry I will try to summarise each of the books.Book II of the Essay tells us of Locke's theories, these include his distinction between ideas we just accept which he calls simple ideas, these could be things such as “red”, “sweet” or “round” compared to the complex ideas, which we have to work on such as numbers, causes and effects, abstract ideas, ideas of substances, identity, and diversity. Locke also shows the differences between the primary qualities of bodies – which properly exist or as he says truly exist, like shape, motion and the arrangement of particles, and the secondary qualities that are "powers to produce various sensations in us" such as "red" and "sweet."
These secondary qualities, Locke claims, are dependent on the primary qualities. So primary qualities exist, and these create the secondary qualities. For example if something’s primary qualities are: red, sweet and round. It’s secondary qualities will be it’s an apple which are "powers to produce various sensations in us".
Book I
Locke's big idea is that the mind of a newborn baby is a blank slate (or tabula rasa) this means he thinks that all ideas we have are from experience. Book I of the Essay is essentially an attack on the doctrine of innate ideas, this idea meant that we have ideas that we intrinsically know from birth. Locke said that some ideas are in the mind from an early age, but stated that these ideas still come from the senses when we were in the womb (differences between colors or tastes). This still goes against the doctrine of innate ideas as it still says that we still require empirical evidence. If we all have of a concept of ‘sweetness’, it is not because this is an innate idea, but because we were all exposed to sweet tastes at an early age.
Following from this line of thought, Locke also argued that people have no innate principles, this means that no one naturally knows from right or wrong. Locke did say that if we have innate principles they would have to rely upon our innate ideas, which he says does not exist. One of Locke's big arguments against innate ideas is the fact that there is no truth to which all people agree with. He argued against a number of propositions that rationalist offer as universally accepted truth, like the ‘principle of identity’, to which he said that young children are unaware of their own identity.
Book II
Whereas Book I was rejecting the doctrine of innate ideas first done by Descartes and the rationalists, Book II explains that every idea comes from experience either by sensation or reflection which Locke explains as:
"the perception of the operations of our own mind within us, as it is employed about the ideas it has got".
Book III
Everything that exists is a particular thing. Frisky, Snowball, and Tiger are pets in the external world, but there is no cat. Most of our terms are general rather than particular i.e. a cat could be Frisky, Snowball, and Tiger. In book III Locke asks in How do we get these general terms? Since words refer to ideas, general terms, naturally, refer to general ideas. General ideas are produced through a process of abstraction. We take our ideas of Frisky, Tiger, Felix, and Snowball, and we attend to what is similar in all of these, discarding what is different. From what is common to all of them (fur, soft, meow, arched shape, etc.), we form a new idea.
Book IV
"Of Knowledge and Opinion," gives us the theory of knowledge. Locke begins with a strict definition of knowledge, one which says most sciences (apart from mathematics and morality) are pointless. Knowledge, according to Locke, is having strong internal relations that work, without any reference to the outside world. He lists the four sorts of relations between ideas that would count as knowledge identity/diversity, relation, coexistence, actual existence, he then goes on to distinguish between three grades of knowledge. The remainder of the book is discussing opinion or belief, which is the best we can expect to gain for our intellectual endeavors.
So essentially Locke's Essay on Human Understanding would get an A* from any Philosophy teacher as he totally influenced the Western Philosophers who agree with the idea of empiricism.
The fire (no, it's not a cabbage) moves the skin, this action then opens a pore causing the 'animal spirit' of the fire flow through the tube in the diagram this tube then inflates, causing swelling in the leg muscle this results in the moving of the foot out of danger. Nothing to do with nerve endings or pain receptors. 