Additionally , things can be causes of one another , reciprocally causing each other , as hard work causes fitness , and vice versa - although not in the same way or by means of the same function : the one is as the beginning of change , the other is as its goal .

This includes modern ideas of causation , such as wanting or needing something to be , or those that give a purpose to behaviour Additionally , things can be causes of one another as hard work causes fitness , and vice versa .
