{The goodness and the severity of God} (chr(8873)tot(8874)a kai
apotomian theou). See on  Ro 2:2  for chr(8873)tot(8873), kindness of
God. Apotomia (here alone in the N.T.) is from apotomos, cut
off, abrupt, and this adjective from apotemn(935c), to cut off. This
late word occurs several times in the papyri. {If thou continue}
(ean epimen(8869)s). Third class condition, ean and present
active subjunctive. {Otherwise} (epei). Ellipse after epei,
"since if thou dost not continue." {Thou also} (kai su).
Precisely as the Jewish branches of verse  17  were. {Shalt be
cut off} (ekkop(8873)(8869)). Second future passive of ekkopt(935c), to
cut out.