You don’t learn anything from buying, but you do from selling.
More Russian Proverbs:
A virgin's heart is a dark forest.Russian
One never tires working for oneself.
Russian
If you don't crack the shell, you can't eat the nut.
Russian
Keep your eye on the ball and your head in the game.
Russian
Small children give you headache; big children heartache.
Russian
It's better to be known as a rascal than a fool.
Russian