For they verily for a few days chastened us after their own pleasure; but he for our profit, that we might be partakers of his holiness. The a fortiori argument is thus continued. The discipline of our earthly fathers was "for a few days," i.
e. during our childhood only, since which we have been left to ourselves; and even then not necessarily for our greatest advantage; it was only as seemed good to them ( κατὰ τὸ δοκοῦν αὐτοῖς); it might be injudicious, or even capricious.
But our heavenly Father's discipline we may trust to be always good for us, and with a definite final purpose. Though there is here no distinctly expressed antithesis to the "few days" of ordinary parental chastisement, yet one is implied in the last clause; for if God's purpose in chastening us is to make us partakers of his own holiness, we may conclude that the discipline will be continued till the end be attained; and thus also a further reason is implied why Christians should not "faint" under even lifelong trials.