The joy of chemistry is in the doing, not just the discovering.
因此,得到了士的辅佐,君主谋划国事就不困难,身体就不劳累,功成名就,美善彰显二丑恶杜绝,这是得到了贤士的缘故啊! 
Reinforcement is the central factor in the acquisition of new behavior patterns.