 There is another problem about the theory of truth which the Aristotelian argument seems to be invoking. If the theory really is that the truth of what is said depends on the state of the world at the time of the saying, does not that raise a problem for statements about the past? Suppose someone says that a dinosaur stood on this spot millions of years ago. For this to be true, must the present state of the world be such as to determine that it is? Some people have indeed thought this; and they have thought that, just as some propositions that were not true come to be true, so also some that were true cease to be true (Łukasiewicz 1967). But this is even further from what we are naturally inclined to say. A more attractive alternative, if we wished to retain something like this theory of truth, would be to say that what happened in the past counts as part of the present state of the world, because the past, like the present, is necessary. But it is not clear why that should be enough to make it part of the present state of the world. Perhaps it would be better to take the view simply that something is true at a time only if it is necessary at that time. But then we would need some argument for this position which went beyond the simple thought that what is said is made true by the way the world is at the time it is said.