Seek knowledge and teach it to people. Learn dignity and tranquillity, and be humble towards those from whom you learn knowledge and be humble towards those to whom you teach it, and do not be tyrannical scholar otherwise your knowledge cannot be established because of your tyranny.
UmarI will be harsh and stern against the aggressor, but I will be a pillar of strength for the weak.I will not calm down until I will put one cheek of a tyrant on the ground and the other under my feet, and for the poor and weak, I will put my cheek on the ground.
Umar