John Lochtefeld describes "artha" as the means of life, and includes material prosperity. Karl Potter explains it as an attitude and capability that enables one to make a living, to remain alive, to thrive as a free person. It includes economic prosperity, security and health of oneself and those one feels responsible for. Artha includes everything in one's environment that allows one to live. It is neither an end state nor an endless goal of aimlessly amassing money, claims Karl Potter, rather it is an attitude and necessary requirement of human life. John Koller takes a different viewpoint than Karl Potter's interpretation. John Koller suggests artha is not an attitude, rather it is one of the necessities of human life. A central premise of Hindu philosophy, claims Koller, is that every person should live a joyous and pleasurable life, that such fulfilling life requires every person's needs and desires be acknowledged and fulfilled, that needs can only be satisfied through activity and when sufficient means for those activities are available. Artha, then, is best described as pursuit of activities and means necessary for a joyous and pleasurable life.