Prediction is very difficult, especially about the future.

The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.

You can recognize a small truth because its opposite is a falsehood. The opposite of a great truth is another truth.

There are trivial truths and there are great truths. The opposite of a trivial truth is plainly false. The opposite of a great truth is also true.

Truth is something that we can attempt to doubt, and then perhaps, after much exertion, discover that part of the doubt is not justified.