There is no such thing as a free variable.
We are on the verge: Today our program proved Fermat's next-to-last theorem.
If you have a procedure with 10 parameters, you probably missed some.
A LISP programmer knows the value of everything, but the cost of nothing.
A picture is worth 10K words - but only those to describe the picture. Hardly any sets of 10K words can be adequately described with pictures.
A good programming language is a conceptual universe for thinking about programming.