Summary of passages: Isaiah speaks of a vineyard (the people of Judah, Israel, and Jerusalem) and describes how they have the expectations of bearing good grapes but they only yielded bad fruit. In John, Jesus is speaking at the Last Supper, charging his disciples to go forth and bear fruit–fruit that will last and giving them the command to love one another as He has loved them. He uses the vine and fruit analogy as well, saying, “No branch can bear fruit by itself; it must remain in the vine. neither can you bear fruit unless you remain in me.” (verse 4)
3a) The song was sung to and about the house of Israel and the people of Judah and Jerusalem. It was sung by Isaiah.
b) Yes. Who expects to plant a crop and it to fail? God planted us and we thrived until the Garden and sin slithered in.
c) The crop was bad but the owner expected the best grapes (he planted the choicest vines, built a watchtower, cleared the stones, and chose fertile ground). He expected to make a profit as all business owners do.
4) God expected a garden filled with delight, justice, and righteousness. Jesus describes fruit that will last. Galatians list the fruit of the spirit–love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, and self-control. I’m inferring this is what Jesus was inferring as well.
5) Personal answer. Mine is: He has put people on my path who has led me to Him (parents, friends, BSF invite) and spoken to me. He helps others know him through people as well. He has provided all I need and want and loved unconditionally. He has sent His son, Jesus, for me. He has provided His word (the Bible) forever.
Conclusions: I enjoyed the imagery of the vine. It ties into the whole Branch as the Messiah we have been talking about. I liked seeing it in other places of the Bible as well.