For mammals like us, mothers play an essential role in life. Before the arrival of civilization, infants could not survive without the milk mothers provide. With the advent of artificial nourishments for the babies, mothers are still indispensable for our existence, especially in the early periods of life.
Thus, it is not surprising that we have developed a wide usage of the metaphor "mother".
For example, the expression "mother nature" has a deep resonance for a human being. Nature provides us with food, gives us protection, and supports our day to day life materially.
The mother nature metaphor is so natural to us that it is deeply unnerving and then ultimately revealing to realize that the universal concept has originated from the very particular condition in which our specific life style is to be kick-started and nurtured. It is an instance of a particular transforming itself to a universal.