A gem is not polished without rubbing, nor a man made perfect without trials

Similar sayings:

The gem cannot be polished without friction, nor a man perfected without trials The gem cannot be polished without friction, nor a man perfected without trials
The diamond cannot be polished without friction, nor the man perfected without trials The diamond cannot be polished without friction, nor the man perfected without trials
Life is partly what we make it, and partly what it is made by the friends whom we choose Life is partly what we make it, and partly what it is made by the friends whom we choose
If Heaven made him, Earth can find some use for him If Heaven made him, Earth can find some use for him
Manners maketh man Manners maketh man

Chinese sayings and proverbs