Tell no one the secret that you want to keep, although he may be worthy of confidence; for no one will be so careful of your secret as yourself.

The sea does not contain all the pearls, the earth does not enclose all the treasures, and the flint-stone does not inclose all the diamonds, since the head of man encloses wisdom.

A traveler without knowledge is a bird without wings.

Capacity without education is deplorable, and education without capacity is thrown away.

It is wrong to follow the advice of an adversary; nevertheless it is right to hear it, that you may do the contrary; and this is the essence of good policy.

Kings stand more in need of the company of the intelligent than the intelligent do of the society of kings.

Reveal not every secret you have to a friend, for how can you tell but that friend may hereafter become and enemy. And bring not all mischief you are able to upon an enemy, for he may one day become your friend.