An ounce of prudence is worth a pound of cleverness.
Knowledge without wisdom is double folly.
Never participate in the secrets of those above you; you think you share the fruit, and you share the stones - the confidence of a prince is not a grant, but a tax
Hear, see, and be silent.
When everyone covets something, they are easily annoyed by it.
No' and 'Yes' are words quickly said, but they need a great amount of thought before you utter them.