{In the wilderness} (en t(8869) er(886d)(9369)). Their usual
pasturage, not a place of danger or peril. It is the owner of the
hundred sheep who cares so much for the one that is lost. He
knows each one of the sheep and loves each one. {Go after that
which is lost} (poreuetai epi to apol(936c)os). The one lost sheep
(apol(936c)os, second perfect active participle of apollumi, to
destroy, but intransitive, to be lost). There is nothing more
helpless than a lost sheep except a lost sinner. The sheep went
off by its own ignorance and folly. The use of epi for the goal
occurs also in  Mt 22:9  Ac 8:26  9:11 . {Until he find it}
(he(9373) heur(8869) auto). Second aorist active subjunctive of
heurisk(935c), common verb, with he(9373), common Greek idiom. He
keeps on going (poreuetai, linear present middle indicative)
until success comes (effective aorist, heur(8869)).