What an individual needs ?
As a physical body one needs unlimited sex, unlimited pleasures, unlimited Gulab Jamun, unlimited foreign travels and many such things to entertain him. It is biological need based on the senses and the sensory world.
Why one earn money or want to achieve objects ?
Because it is a natural desire to be happy , and happiness comes when one enjoy using his physical body. We run behind money, girls, houses, lands and want to achieve them. This desire is never ending. In every birth, we want to achieve & become happy.
But the problem is Karma, and their results. Karma always doesn’t give results or it give results which were not expected. Suppose if someone loves a girl & he made efforts for years for achieving her, but still one may achieve her or may not achieve her.
Desires lead to struggle and suffering
Desires even if they are fulfilled or not fulfilled, they impacts an individual.
Every failure to achieve Objects of desire leads to anger, revenge, pain , suffering, problems e.t.c.
What should one do to end struggle and suffering?
Knowledge can only help oneself in understanding the struggle and suffering.
When one have suffered a lot, and he cannot take further hits. He will got to the nearest temple and ask :
Question to God – “If I cannot get what I desire, than why I am born ?”
Answer by God – “Please study Vedas & Upanishads, and figure out that what you are trying to achieve is not the correct purpose”