The most noble human relationships are those that have been formed in a spirit of cooperation and harmony. Cooperation, in many ways, is the physical manifestation of your care and concern for your fellow man. When you work with others in a spirit of friendly cooperation, you are conducting yourself according to the founding principles of most religions and all successful societies. Everyone occasionally feels pangs of jealousy or envy, usually accompanied by the urge to cause problems or difficulty for those we dislike. Truly successful people have learned to restrain such urges. They know that if they concentrate upon their own objectives and help others along the way, they will eventually reach their goals. It isn’t easy to always be a friendly, cooperative person, but in the end you will find that it is worth the effort.
– Napoleon Hill