Rubbing Proverbs

If you can give me no ointment for my wound, can you help me by not rubbing salt in? (Persian Proverb)
A gem is not polished without rubbing, nor a man perfected without trials. View proverb
Chinese Proverb
Constant rubbing of a rope will cut a stone. View proverb
Swahili Proverb
Gems are polished by rubbing, just as men are made brilliant by trials. View proverb
Chinese Proverb
A gem is not polished without rubbing, nor is a man perfect without trials. View proverb
American Proverb
To clean the beak by rubbing it on the ground. View proverb
Ila Proverb