What doesn't kill you makes you stronger

ʃto tʲibʲɑ nʲe ubʲivɑjit dʲeɭʌjit tʲibʲɑ sʲiɭnʲejɪ

In Russian Что тебя не убивает, делает тебя сильнее.

This phrase is a common saying in Russian, emphasizing the idea of resilience.