Nicene and Post-Nicene Fathers, Ser. II, Vol. VII:
Select Letters of Saint Gregory Nazianzen.: Letter LIV

Ep. LIV.

On Laconicism.  To be laconic is not merely, as you suppose, to write few words, but to say a great deal in few words.  Thus I call Homer very brief and Antimachus lengthy.  Why?  Because I measure the length by the matter and not by the letters.