But wilt thou know, O vain man, that faith without works is dead?
Ver. 20. But wilt thou know] Interrogatio doeturientis, saith Piscator. A question made by one that is desirous to teach.
Thou vain man] Gr. Thou empty man; for works without faith are nothing else but a nutshell without a kernel, grapes without juice, chaff without grain, saith Mercer in John 3:8 .