Work without Motive

Swami Vivekananda says :

What is the meaning of working without motive?
Nowadays many understand it in the sense that one is to work in such a way that neither pleasure nor pain touches his mind. If this be its real meaning, then the animals might be said to work without motive. Some animals devour their own offspring, and they do not feel any pangs at all in doing so. Robbers ruin other people by robbing them of their possessions; but if they feel quite callous to pleasure or pain, then they also would be working without motive. If the meaning of it be such, then one who has a stony heart, the worst of criminals, might be considered to be working without motive. The walls have no feelings of pleasure or pain, neither has a stone, and it cannot be said that they are working without motive. In the above sense the doctrine is a potent instrument in the hands of the wicked. They would go on doing wicked deeds, and would pronounce themselves as working without a motive. If such be the significance of working without a motive, then a fearful doctrine has been put forth by the preaching of the Gita. Certainly this is not the meaning. Furthermore, if we look into the lives of those who were connected with the preaching of the Gita, we should find them living quite a different life. Arjuna killed Bhishma and Drona in battle, but withal, he sacrificed all his self-interest and desires and his lower self millions of times. (V, 247)