Proverbs tells us, "Where there is no vision, the people perish: but he that keepeth the law, happy is he." In short, the writer is not talking about something revealed in a trance; he is talking about the revealed will of God. Where there is no revealed will of God, they perish. And then the second part of the verse fits in; he that keeps the law is happy. For the Christian, the revealed will of God is his or her law. Case in point, God revealed His will for Jonah to go to Nineveh. Jonah knew what God wanted and he didn't immediately or willingly follow God's will, but Jonah, and any Christian, should give the same respect to God's will, that they give to the law. In other words, if you ain't in God's will, you ain't happy.
Sometimes God reveals His will to us, and then we want to take the ball and run with it. By take the ball and run with it, I mean that we take what we believe is God's will, and then we try to use our human intellect and abilities to go about accomplishing God's will. It is sort of like God trying to tell us something, and we try to finish His sentence. God wants to be involved in the whole process, from revealing His will to the accomplishing of His will, and we ought to want God to be involved in the process. After all the clay doesn't tell the potter how to mold it, why should we tell God how to use us? God is glorified when we seek His will (the vision), and when we willingly participate, not take over, in accomplishing His will. So, in preaching to myself, I hope that you are blessed by it.