I must disagree with you there. If I tell you that something will happen if you don't do such and such, that is not necessarily clairvoyance, merely giving you the benefit of my own knowledge. Let me tell you a story.
A friend of mine, a priest, in his first year at university, saw on the notice board, " Dr x's lecture this afternoon on prophecy is postponed due to unforeseen circumstances. He wrote on the notice, "Should have seen that coming."
The next morning a note was slipped under his door which read, "Dear Mr y, if you care to attend my rearranged lecture you will find out why you are so terribly wrong."