When his disciple Zai Yu slept during the day, Confucius said: “At first, with people, I listened to their words and trusted their deeds. Now, with people, I listen to their words and watch their deeds. It was Zai Yu who made me change.” (Analects 5.10)
He also said: “The gentleman wishes to be slow in speech and quick in action.” (Analects 4.24)