The wheel of fortune turns round incessantly, and who can say to himself, I shall today be uppermost.
When you know a thing, to hold that you know it, and when you do not know a thing, to allow that you do not know it - this is knowledge.
The virtuous man is driven by responsibility, the non-virtuous man is driven by profit.
Don't do unto others what you don't want others to do unto you.
Be in harmony, yet be different.
The master said, 'Quietly to store up knowledge in my mind, to learn without flagging, to teach without growing weary, these present me with no difficulties.'