Once mastered, you will never look back - but remember to practice.
一旦掌握，你就再也不会回头了——一定要记着练习。
Remember to look back upon your mistakes from time to time, but never regret them.
记得常回头看看以前犯的错误，但绝不要为它们感到后悔。
Remember to look back at your mistakes from time to time, but never regret them.
记得回头看看之前犯的毛病，但毫不要悔怨。 。
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