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.
I never complained of the vicissitudes of fortune ... except once when my feet were bare, and I had not the means of obtaining shoes. I came to the state of Kufah in a state of dejection, and there saw a man who had no feet.
The beloved of the Almighty are the rich who have the humility of the poor, and the poor who have the magnanimity of the rich.