I think you're making this more complicated than it is. SPEIRW and QERIZW
here are obviously metaphors, but the usage of EIS and EK in this verse
reflect the reality of earthly sowing and reaping that are their analogues:
one sowing puts the seed INTO the ground and one reaping draws the crop OUT
OF the ground; the same prepositions are applied to spiritual sowing and
reaping.
Carl W. Conrad
Department of Classics, Washington University
One Brookings Drive, St. Louis, MO, USA 63130
(314) 935-4018
cwconrad@artsci.wustl.edu OR cwc@oui.com
WWW: http://www.artsci.wustl.edu/~cwconrad/