{But wilt thou know?} (	heleis de gn(936e)ai?). "But dost thou
wish to know?" Ingressive aorist active infinitive of ginosk(935c)
(come to know). James here introduces a new argument like  Ro
13:3 . {O vain man} ((9320)anthr(9370)e kene). Goes on with the
singular objector and demolishes him. For "empty" (deficient)
Paul uses aphr(936e) (fool) in  1Co 15:36  and just anthr(9370)e in
 Ro 2:1  9:20 . {Barren} (arge). See  2Pe 1:8  (not idle nor
unfruitful) and  Mt 12:36 , but Hort urges "inactive" as the idea
here, like money with no interest and land with no crops.