Don’t say you can’t change the world.
Have you tried it?
You can’t make this much progress, unless you try.
Just because it hasn’t been done, doesn’t mean it can’t be done. So when they say it’s not worth your time. Or not worth the effort. When they tell you it’s bound to fail. Or certain to flop. When they mention it’s too risky. Or too costly. When they shake their head. Or scratch their chin. When they say don’t bother. Or it’s not worth it. Ask them, how do you know if you haven’t tried it?