It’s an interesting thing, that we can teach what we most need to learn. That through helping others, we help ourselves. One of the challenges anciently, and probably modernly as well, is if we ourselves are not Sages, how can we discuss and even teach philosophy? If we don’t have virtue, how can we lecture or write about it.
The answer I’ve read elsewhere is that even if we don’t know the Truth, we can teach something true. You sometimes see this idea in mythology: a thing doesn’t have to be real to be true.
Philosophy, then, seems similar. We don’t yet have virtue ourselves, but we can still see that it’s desirable.