You have to understand Colossians 1:26 in the context of the rest of what the prophets said as well. The Gospel is not exactly what we have been told by State ordained ministers. It is Good News- For SOME people-and a promise of destruction for others, to the gratification of the Elect. These things are intentionally not clear, because God has no desire to save EVERYONE in the world. The same reason He only spoke to people in parables.