This section is from the book "Mahanirvana Tantra (Tantra of the Great Liberation)", by Translated by Arthur Avalon (Sir John Woodroffe). Also available from Amazon: Mahanirvana Tantra: Tantra of the Great Liberation.
Artha (wealth) stands for the means by which this life may be maintained, in the lower sense, food, drink, money, house, land, and other property; and in the higher sense the means by which effect may be given to the higher desires, such as that of worship, for which artha may be necessary, aid given to others, and so forth. In short, it is all the necessary means by which all right desire, whether of the lower or higher kinds, may be fulfilled. As the desire must be a right desire, for man is subject to dharma, which regulates them, so also must be the means sought, which are equally so governed.
This first group is known as the trivarga, which must be cultivated whilst man is upon the pravritti marga. Unless and until there is renunciation on entrance upon the path of return, where inclination ceases (nivritti marga), man must work for the ultimate goal by meritorious acts (dharma), desires (kama), and by the lawful means (artha) whereby the lawful desires which give birth to righteous acts are realized. Whilst on the pravritti marga "the trivarga should be equally cultivated, for he who is addicted to one only is despicable" (dharmartha-kamah samameva sevyah yo hyekasaktah sa jano-jagha-nyah).
 
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