Confucius

I hear and I forget. I see and I remember. I do and I understand.

 Confucius, in  Wisdom and Ignorance

To know is to know that you know nothing. That is the meaning of true knowledge.

 Confucius, in  Wisdom and Ignorance

Your eyes are always bigger than your stomach.

 Confucius, in  Food and Drink

A man who has committed a mistake and doesn't correct it, is committing another mistake.

 Confucius, in  Success and Failure and  Wisdom and Ignorance

He that would perfect his work must first sharpen his tools.

 Confucius, in  Work and Recreation