Truth is something that we can attempt to doubt, and then perhaps, after much exertion, discover that part of the doubt is not justified.
If we couldn't laugh at ourselves, that would be the end of everything.
If an idea does not appear bizarre, there is no hope for it.
Prediction is very difficult, especially if it's about the future.
Some things are so serious, they can only be joked about.
If quantum mechanics hasn't profoundly shocked you, you haven't understood it yet.