The video below demonstrates Stephen Krashen’s influential notion of “Comprehensibe Input” far better than I could explain it. Watch the video, then read the discussion below.
How could this perspective be applied to teaching Ancient Greek? I am certain that Krashen is correct in his assessment of the nature of language acquisition, but teaching an ancient language presents some special problems that make his method extremely difficult.
No materials designed specifically to support this kind of teaching exist for Hellenistic Greek as far as I know (though some limited attempts have been made). My own online grammar is certainly not suited to this purpose. I wrote most of it far too long ago. It is focussed on learning Greek, not acquiring it (See “Acquiring and Learning Greek“).
I would like at some point to begin to create materials to support this kind of instruction for Hellenistic Greek, but that’s a major project that is going to have to wait quite a while.