The rose and the thorn, and sorrow and gladness are linked together.

Whatever makes an impression on the heart seems lovely in the eye.

However much you study, you cannot know without action.
A donkey laden with books is neither an intellectual nor a wise man.
Empty of essence, what learning has he whether upon him is firewood or book?

I fear God, and next to God I chiefly fear him who fears Him not.

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

Nothing is so good for an ignorant man as silence; and if he was sensible of this he would not be ignorant.