My family is from Germany, I don't know how to speak the language, although my grandfather was fluent. His favorite phrase was "Made strong through the struggles" and I believe it went something like "stark durch die Kämpfe". Just looking for the correct translation.
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"Was uns nicht umbringt, macht uns stärker" (What doesn't kill us only makes us stronger) would be a similar quote by Nietzsche.
If this is idiomatic, a saying in Germany is
this doesn't refer to battles but to (difficult) life in general as the hardening factor, but it's the only idiom that comes to mind.