With man this desire is never satisfied. He always wants to know more. There is ever a restless craving within him for knowledge. This is because he does not look for the cause in the right way; he only sees the external causes, and not the cause underlying the cause, and below that, the primal cause. For example, a man who has become estranged from his friend only sees perhaps the superficial cause, and calls his friend unkind; or he may even admit that he himself is at fault, or he may go still deeper and say that owing to a certain planetary influence they cannot be friendly; yet he has not probed the cause of this cause.