Thinking about language, while thinking _in_ language, leads to puzzles and paradoxes.
The trouble with the dictionary is that you have to know how a word is spelled before you can look it up to see how it is spelled.
That is the strangeness of language: it crosses the boundaries of the body, is at once inside and outside, and it sometimes happens that we don't notice the threshold has been crossed.
Why do 'slow down' and 'slow up' mean the same thing? Why is the third hand on the watch called the second hand?
Language can do what it can’t say.
If 'pro' is the opposite of 'con' what is the opposite of 'progress'?