GREAT NEWS!!!
Getting discouraged is exactly what Satan wants. Like you said God's word never comes back void and quite often we never see the fruits of our labor, but that doesn't mean there is no fruit.
I am not going to mention any names, but there are people here that you witness to all the time.... Well if they accept Christ or not, you did your part.
I had "sort of" a vision one day. We had passed into eternity and I could see a co-worker of mine in eternal torment and he looked at me from hell and said, "Why have you never told me about Christ? You knew, yet you never told me."
I am in charge of the Media Ministry at our church and am often disapointed at the lack of growth in this ministry, but looking back I see that we have come a long way and that through this ministry several people have come to Christ.
I guess even if only one soul was saved it would be worth it.
Gary, next time you go to visit Emmanuel Baptist Church I hope that you look me up, after all, I only live like a mile away from there.