Oracles telling the future? Maybe not... However generic, sort-of true if you want to belive it, statements work best:
\"You shall be defeated in a horribly bloody battle... But not before causing a great change within the world.\"
or to a player of great consiquence (IE: A king/queen)
\"You shall not be defeated until the forest reaches the castle walls.\"
That second one if from Macbeth, btw. A character [and his army each] chopped down [a] tree, and carried them to Macbeth\'s castle. Who said they had to
grow their way to the castle?

[An alternative to this is to have the oracle give a random effect w/ said text message to the player \"You will fall in battle, but shall not die and will rise again!\" could place a effect on the player to cause him to self-resurrect; making the Oracle\'s pridiction true. (of course, the effect from the oracle wouldn\'t be immediately obvious and could only be given out once in a great while)]