There are exceptions to the general pattern evaluation functional forms.
For instance, a special functional form is QUOTE.
Quote is used to suppress the evaluation of an expression in a place in which it would otherwise be evaluated.
(defun sum (x y)
(+ x y))
(quote (sum 2 3))
(SUM 2 3)
The single quote mark ' is an abbrevation for the QUOTE form.
Thus '(sum 2 3) is equivalente to (quote (sum 2 3)) .
In other words QUOTE returns its single argument, as written, without evaluating it.
You can define a global var like:
(defparameter *wizard* (quote (sum 2 3)))
The value of the variable is (SUM 2 3) so, if you want to evaluate it you need to use eval function like:
(eval *wizard*)
and you get 5 as result.