ὀπίσω [15 verses](prep/adv) "Back" is from opiso, which means "back," "behind," and "hereafter." -- The term translated as "back" means "back" in space but "after" in time. It is followed by a possessive which tells us whose back it is. The logic regarding time is that, since the future is unseen, it should be regarded as behind us, whereas the past is known and therefore before our eyes. This seems quite strange to English speakers, but the use of this word in Greek is well-established to mean "future." Our English view coincides with the ancient Greek when discussing books. The "back" of the book in English means the "end" of the book, which is the future for the reader. This use of "back" is identical to the Greek.