“Many persons have a wrong idea of what constitutes true happiness. It is not attained through self-gratification but through fidelity to a worthy purpose.” – Helen Keller
There are a great many purposes to which you can dedicate your life. Some purposes will prove to broaden the scope of human achievement while others will bring man closer to knowing the true meaning of life. Material progress does not necessarily correlate with spiritual advancement, neither are the two mutually exclusive.
The purpose of man, to put it simply, is to safeguard the connection between the spiritual and the material, the invisible and the visible. Absent this connection, the world is disconnected from its source and man is left ruler over a dying kingdom in which light makes only the darkness visible.
Fidelity to a worthy purpose is the only means by which true, lasting happiness is known. Anything else may produce a sense of gratification, but it will be shallow and fleeting.
You have two central responsibilities in life: 1) to become aware of the purpose of your being and 2) to remain loyal to it.
The rest is just details…