Justice and Bravery
Son! Develop these two qualities. Never shun them. These qualities will save you from the fire of hell. Discarding these two qualities will result in misery.
It is stated in the traditions that one who has no bravery has no religion. The most difficult task is to do justice to yourself.
(Usul-e-kafi-2, p 145)
Justice means preferring for others what you prefer for your self and preferring for others what you do not prefer for yourself.