One should always aspire for increment of strength, food and long life because each of them is dependent on other.
The ultimate objective of human life is to be free from sin.
Those who lead disciplined and orderly lifestyles they achieve all their goals and progress.
We should worship lord Shiva so that we are freed from our worldly attachments just like a fruit falls from a tree after ripening. Once we are successful in doing this we are liberated from this vicious cycles of life and death.