If you wish to succeed, you should use perdistence as your good friend, experiece as your reference, prudence as your brother and hope as your sentry.
如果你希望成功，当以恒心为良友、以经验为参谋、以谨慎为兄弟、以希望为哨兵。
You have to believe in your dreams before they can come true.
The key to solving complex problems is often to find the right abstraction that simplifies the problem without losing its essential features.