N-now th-that that don't kill me
Can only make me stronger

from Kanye West – Stronger Lyrics on Rap Genius

Meaning

“What doesn’t kill us makes us stronger.”

    -Friedriech Nietzsche

The meaning of this is that an event that hurts you emotionally or physically will produce two circumstances:

The problem with the second one is that it can effect the person live in a negative way as well, for example a person who broke up with a significant other might set up a wall to never let a person into their lives like that again which can hurt them in building relationships with others.

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