All experience is subjective.
Logic can often be reversed, but the effect does not precede the cause.
Science probes; it does not prove.
The creature that wins against its environment destroys itself.
The map is not the territory (coined by Alfred Korzybski), and the name is not the thing named.
Some tools of thought are so blunt that they are almost useless; others are so sharp that they are dangerous. But the wise man will have the use of both kinds.