José asked:

How can I know if your theories are true, if in philosophy there is no way to practice it, like for
example medicine? Where and when do you practice your philosophy?

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For any theory, if there is no way (in principle) of finding out whether it is true, then it really isn't a
theory. Theories make predictions, and there must be some criteria for deciding whether or not the
prediction is correct. There is actually very little theory making in philosophy; theories belong more or
less by definition to science. And philosophy is not a science. The little theory making that there is in
philosophy is metaphysics. And as you seem to be hinting in the question, there are good reasons for
doubting the validity of such speculation. Metaphysics has had a hard time of it this century, thanks
mainly to the influence of Wittgenstein, and of the logical positivists. Many people have concluded
that metaphysics is just nonsense, or at best the expression of a certain attitude to life.

Instead of making predictions about the ultimate nature of reality, philosophers have concentrated
much more on language. Wittgenstein said that all philosophy is just 'a critique of language'.
Philosophical problems are, from this perspective, problems not about things but about grammar,and
there solution comes not from a greater knowledge of the world but from a greater understanding of
how language can trick us into confusion.

The time and place philosophy is practiced is in a philosophy class. Because this is the only time
when purely philosophical problems arise. In everyday life, there are no philosophical problems, in
building a wall for example. Philosophical problems arise when 'language goes on holiday'.

Will Greenwood