The article talks about the integrity and the character necessary to be succesfull in life. It says that if you want to have success you must be able to value every action of your life. You always have to be able to give a helping hand to people who need it. The most important and great people, in the crucial moment of a decision they draw upon their wisdom. So above all they have integrity.
The aspect of leadership covered is the behaviour every succesfull person have and the main aspects of their character.
The author about leadership say that character is what you are. The succes is something you can achieve. If you achieve it without integrity and character it is nothing, merely shadow.
What the author says affects everyone, every action of every people in the world. In fact if everyone acted with integrity and character, in everything s/he does, it would probably be a better world. There would be less violence, less corruption, less bad and more good.
The important thing of the article is that it gives everyone a lesson of life.
I completely agree with the author in fact I always try to do what I think is right not what is better for me or for people around me. "weakness of attitude become weakness of character" said Einstein, and I completely agree. If you get used to something is not right for you, or your character then you become weak, a fake.