Many people talk about Mental Strength as though it is one simple skill or character trait.
If you are strong enough mentally, you can just grit your teeth and get on with it and get to the other end in one piece (more or less).
You are mentally tough or you’re not.
Come on.
Just do it.
Grit your teeth.
Suck it up.
What doesn’t kill you makes you stronger.
In reality, as usual, nothing is quite that simple.