knew not - that is knew but partially; for some knowledge is presupposed both in the name “servant” of Christ, and his being liable to punishment at all.
many ... few stripes - degrees of future punishment proportioned to the knowledge sinned against. Even heathens are not without knowledge enough for future judgment; but the reference here is not to such. It is a solemn truth, and though general, like all other revelations of the future world, discloses a tangible and momentous principle in its awards.