Lisp obeys the convention that every expression has a value. This
convention, together with the old reputation of Lisp as an inefficient
language, is the source of quip by Alan Perlis (paraphrasing Oscar
Wilde) that "Lisp programmers knows the value of everything but the cost
of nothing".
From Hal Abelson's, Jerry Sussman's
and Julie Sussman's Structure and Interpretation of Computer Programs
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