Four different types of human beings

Reading Swami Vivekananda. Found this very interesting. I didn't found the original Sanskrit Shloka from he has taken. He says there are four fundamental type of a person.

1) A God like person, who can sacrifice anything for the good of others. They are highest of all. He says if there are 100 like these in any country it should never feel hopeless. But they are very rare.

2) A good human being who helps other until he or she it doesn't hurt own self.

3) A selfish person who hurts somebody for his or her own good.

4) A person who hurts other people without any reason or purpose. Just for hurting them

The principal of Karma is at very core of Shrimad Bhagvad Gita's teachings. It's called 'Karma Yog' by Krishna.I am very curios about it works or not! How much it is true for the real life! Are there any measured results of it ? The faith is a different thing and the science is too. Can it be topic for metaphysics ? I am just curious so.