Speaking in Tongues: Do you think that speaking in tongues is still valid today? Walking in the Spirit: What does it mean to "walk in the Spirit?" Recommends Vol 2 of the book "Empire of the Risen Son:" Jewish Unbelief God's Doing: Isn't it God's doing that the Jews are unbelievers, not accepting Jesus as Messiah? [Matthew 23:35-36, Romans 11:8, Matthew 13:14-15].