The Supreme Lord is situated in everyones heart, O Arjuna, and is directing the wanderings of all living entities, who are seated as on a machine, made of the material energy. (Bg. 18.61) The Supreme Personality of Godhead, the Supersoul, is present in everyones heart, and as the living entity desires, the Lord gives him facilities with which to work according to his ambitions in different grades of bodies. The body is just like an instrument by which the living entity moves according to false desires for happiness and thus suffers the pangs of birth, death, old age and disease in different standards of life. Everyone begins his activities with some plan and ambition, but actually, from the beginning of ones plan to the end, one does not derive any happiness. On the contrary, as soon as one begins acting according to his plan, his life of distress immediately begins. Therefore, one should not be ambitious to dissipate the unhappy conditions of life, for one cannot do anything about them. Ahankara-vimudhatma kartaham iti manyate [Bg. 3.27]. Although one is acting according to false ambitions, he thinks he can improve his material conditions by his activities. The Vedas enjoin that one should not try to increase happiness or decrease distress, for this is futile. Tasyaiva hetoh prayateta kovidah. One should work for self-realization, not for economic development, which is impossible to improve. Without endeavor, one can get the amount of happiness and distress for which he is destined, and one cannot change this. Therefore, it is better to use ones time for advancement in the spiritual life of Krsna consciousness. One should not waste his valuable life as a human being. It is better to utilize this life for developing Krsna consciousness, without ambitions for so-called happiness.