Do you agree to

Nietzsche, a piece of shit, who inspired the likes of Hitler and Liddy, is still quoted.

No, what does not kill you, does not make you stronger, as a general rule. It could also disable you for life.

"Aus der Kriegsschule des Lebens. — Was mich nicht umbringt, macht mich stärker." Friedrich Nietzsche.

In my experience it doesn't always work though.

No, it's nonsense, like the majority of cliché's are.

It's used as a desperate attempt to make sense and to find some use in hardships but in general it's not true.

It’s definitely not true

🤔I believe that was Jesus

Nope.