Meaning of the word "the gem cannot be polished without friction, nor man perfected without trials" in English

What does "the gem cannot be polished without friction, nor man perfected without trials" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

the gem cannot be polished without friction, nor man perfected without trials

US /ðə dʒɛm ˈkænɑt bi ˈpɑlɪʃt wɪˈðaʊt ˈfrɪkʃən, nɔːr mæn pərˈfɛktɪd wɪˈðaʊt ˈtraɪəlz/
UK /ðə dʒɛm ˈkænɒt bi ˈpɒlɪʃt wɪˈðaʊt ˈfrɪkʃən, nɔː mæn pəˈfɛktɪd wɪˈðaʊt ˈtraɪəlz/
"the gem cannot be polished without friction, nor man perfected without trials" picture

Idiom

a proverb meaning that challenges and hardships are necessary for personal growth and character development

Example:
Remember that the gem cannot be polished without friction, nor man perfected without trials when you face difficulties.
His resilience proves that the gem cannot be polished without friction, nor man perfected without trials.