Imam Ali(A.S) once said to his son Imam Hasan(A.S) , My son,
learn four things from me and through them you will
learn four more. If you keep them in mind your actions
will not bring any harm to you: The greatest wealth is
Wisdom; the greatest poverty is stupidity; the worst undo-ciableness is that of vanity and self-glorification; and
the best nobility of descent exhibits itself in politeness and
in refinement of manner. The next four things, my son,
are: "Do not make friendship with a fool because when he
will try to do you good he will do you harm; do not make
a miser your friend because he will run away from you at
the time of your dire need; do not be friendly with a
vicious and wicked person because he will sell you and
your friendship at the cheapest price and do not make
friend of a liar because like a mirage he will make you
visualize very near the things which lie at a great distance
and will make you see at the great distance the things
which are near to you".
Value of each man depends upon the art and skill
which he has attained.