Man’s Greatest Enemy is His Ego

If you wish to be treated well, treat others well; if you wish that people should be just and fair to you, first be so yourself to set an example.
Man’s greatest enemy is his ego which manifests itself in selfishness. Even in his doing good, in his kind actions, selfishness is sometimes at work. When he does good with the thought that one day it may return to him and that he may share in the good, he sells his pearls for a price. A kind action, a thought of sympathy, of generosity, is too precious to trade with. One should give and, while giving, close the eyes. Man should remember to do every little action, every little kindness, every act of generosity with his whole heart, without the desire of getting anything in return making a trade out of it. The satisfaction must be in doing it and in nothing else.
Every step in evolution makes life more valuable. The more evolved you are, the more priceless is every moment; it becomes an opportunity for you to do good to others, to serve others, to give love to others, to be gentle to others, to give your sympathy to souls who are longing and hungering for it. Life is miserable when a person is absorbed in himself; as soon as he forgets himself, he is happy.
(Hazrat Inayat Khan)