There are trivial truths and the great truths. The opposite of a trivial truth is plainly false. The opposite of a great truth is also true.
If you think you understand it, that only shows that you don't know the first thing about it.
Opposites are not contradictory but complementary.
Physics is the belief that a simple and consistent description of nature is possible.
Some things are so serious, they can only be joked about.
You can recognize a small truth because its opposite is a falsehood. The opposite of a great truth is another truth.