Yes, development and changes are part of following God, Jesus, and the Bible, but the Bible does acknowledge that there are many voices both in the world and in the more ethereal world of Jesus. "Dear friends, do not believe every spirit, but test the spirits to see whether they are from God, because many false prophets have gone out into the world." - 1 John 4:1, NIV. Familiarity with the Bible is a good way to discern one from the other. Knowing Jesus in a personal way is the best way, of course.