Rationalism
vs. Empiricism
Although this is an overly simple
generalisation, there are essentially two major schools of thought or theories
about how we know things. If you study Philosophy at university or read around
the subject in TOK then you are likely to come across these terms at some point
or other. They can also be excellent technical terms or ideas to use in TOK
essays. These two schools of thought are:
Each different theory or school of thought
attempts to explain how we acquire our knowledge, i.e. how we know anything at
all, in a different way.
Before we start!
Both rationalism and empiricism was made
possible by the increasing importance that the Renaissance (14th-16th
Century) placed on finding reasonable explanations about how the world works.
Important thinkers of this time include the scientists Copernicus (1473-1543), Galileo
(1564-1642), Johannes Kepler (1571-1630) and Sir
Isaac Newton (1643-1727) who were pioneering the scientific approach to
learning about the world. It is important to realise that, before this time,
many people didn’t believe that science and reason were valid ways of finding
things out about the world and instead the people of the Middle
Ages tended to rely on religion, mysticism, superstition and tradition as valid
sources of knowledge.
Rationalism
Rationalism is a school of thought that began
with Descartes (1596-1650) whose work began the ‘Age of Reason’ a
period that loosely covers the whole of the 17th Century. Other
important thinkers of the time include Leibniz (1646-1716) and Spinoza (1632-1677).
Essentially, rationalists believe that (some) knowledge can be acquired through
reason alone or, to put it another way, you can come to know about the world by
thinking about it. Thinking about the world logically allows you to construct a
complete system or entire set of rules that explain everything.
Rationalists tended to believe that knowledge
is a bit like maths and that, by thinking clearly enough about things, you can
come to know everything without ever having to actually look at the world. As a
result rationalists believed in a priori knowledge, knowledge
that comes before experience. Take the example of 2+2 = 4. Once you know what
the terms mean you can figure out that 2+2 = 4 without actually having to do
experiments on 2s and 4s and +s … you just know because 2 ‘means’ the
thing that, when you add it to another 2, gives you 4. And you will just know
that 4-2 = 2, in exactly the same way.
The ‘Age of Enlightenment’ followed
after the ‘Age of Reason’ and lasted, more or less, for the whole
of the 18th Century. During this period of time the thinking of
Descartes influenced other European philosophers including Voltaire, Rousseau
and Paine. These philosophers and thinkers (although the term is very broad
because Voltaire was a playwright) challenged the idea of religion and faith as
a way of knowing about things and believed that truth could only be reached through
the exercise of reason - divine revelation and the teachings of the Church,
they said, were not valid sources of knowledge. Many Enlightenment thinkers
also attacked the power of the State and the Monarchy’s claim to have supreme
authority over what was true or right. As such the Enlightenment is often
linked to the revolutionary movements that overthrew the monarchies of
Empiricism
Broadly speaking, empiricism is not actually
that much different to rationalism. Both groups believe in the importance of
reason and both groups contain scientists but empiricists believe that reason
alone is not enough and that you need to provide your reason with material to
work on … which you can only acquire through your senses. As such, for the empiricists,
perception is the source of all knowledge and reason just works on the evidence
or perception that perception provides.
Therefore, while rationalists tended to think
that all knowledge was like Maths and that it could be known a priori (before
experience), empiricists to believe that all knowledge was more like science
and that things could only be know a posteriori,
i.e. after or through experience. As such, in order to find out about the world
you have to conduct a series of experiments on it and then use reason to work
out what those results mean. John Locke (1632-1704), the first British
empiricist, argued that nothing could be known before experience and that a
baby was like a ‘blank slate’ that had to be filled up with information by
experience.
Other important empiricists were Berkeley
(1685-1753) and Hume (1711-1776).
Romanticism
The story doesn’t stop there, however, because
the Romantics of the 19th Century subsequently
revolted against this high status that had been given to reason and poets such
as Wordsworth, Byron, Shelley, Keats and Coleridge argued against the reduction
of nature to purely scientific, rational and logical elements. They believed
that thinking about the world in purely scientific and factual terms meant that
you were missing something and instead they believed that using the emotions
was a better way to gain truth and knowledge.
As such the Romantics stressed feelings such as
the awe experienced when you witness the power and beauty of nature and they believed
that these could provide you with deeper and more profound truths than the
truths of science.
In a sense, they advocated a return to some of
the spiritualism of the Middle Ages and thus these three hundred years of
history are a clear example of how philosophical thinking tends to move in
cycles, starting with one set of beliefs and then moving to another as that
first set is challenged only to move back to a version of the original beliefs
later when the second set of beliefs is in turn found inadequate.
This continual swinging back and forth between
different ideas is called a dialectic
and a philosopher called Hegel believed that this is how we eventually ‘home in
on’ the truth. The important thing is not that one side proves the other wrong
but by swinging back and forth between the two sides you eventually get rid of
the things that are wrong with both sides and are left with the truth, a
synthesis of the best ideas from each side. In a sense it is a bit like
iteration in maths: you get closer and closer to the truth each time.